Start your engines!
: Add .
Max Speed — , : Mill seven cards. Choose a playtest card from among them. You may cast it without paying its mana cost. If Team Cloudspire won the race, copy it and you may choose new targets for the copy. If Team Speed Demons won the race, each opponent loses life equal to its mana value.
The Mystery Raceway can be your commander.

Whenever a creature you control becomes blocked, round both its power and toughness up to the nearest 5. (A creature with 5 power would round up to 5.).
Whenever Chaos ensues, Amass Fans 5. (Put five +1/+1 counters on an Army you control. It's also a Fan. If you don't control an army, create a 0/0 red Fan Army creature token first.)

Raid — At the beginning of your second main phase, for each player dealt combat damage this turn, you get a point counter and create a 2/2 black Pirate creature token with menace.
Whenever you planeswalk away from here, each player with the most point counters or tied for the most point counters creates three Treasure tokens and draws three cards. Then remove all point counters from each player.
Whenever Chaos ensues, proliferate for each Pirate you control.

During deck construction, name a Nephilim card originally printed in Guildpact. Awoken Nephilim has that card's color identity and is a copy of that card in all zones except it's also Legendary.

When you planeswalk here and at the beginning of your upkeep, create a Black Lotus artifact token.
Whenever Chaos ensues, each player draws a card for each artifact token they control.

Hexproof from red
: Add .
, : Create two Food tokens named Hot Dog.
Whenever you sacrifice a Hot Dog, create a Treasure token.
Food Crew 2 (Tap two Foods you control: This Vehicle becomes an artifact creature until end of turn.)

When you encounter this, Each player opens a Magic the Gathering booster pack. They may select up to two cards from that pack and exile them face down. For the rest of the game, players may look at and play cards exiled this way without paying their mana costs. (Then Planeswalk away from this phenomenon.)

(: Add .)
The Belligerent and Useless Island enter the battlefield tapped.
When The Belligerent and Useless Island deal combat damage to a player or battle, draw a card, then discard a card.
Crew 2

: Add one mana of any color. You get two poison counters.

When you encounter this phenomenon, starting with the next player in turn order, that player chooses a permanent type. The next player chooses a number between 1 and 10. The next player chooses a keyword counter. Then reveal and resolve the following ability with those words. (don't reveal the second ability before the words have been chosen!)
Each player creates a token that's a copy of a [permanent] and puts [number] +1/+1 counters on it. If it's not a creature, it becomes a 0/0 creature in addition to its other types. It enters with [keyword] counter.

: Add one mana of any color in your commander's color identity. If you control a Command Tower and a Command Power Plant, add two mana of any color in your commander's color identity instead.

When you encounter this phenomenon, open a Magic: The Gathering booster pack and shuffle it without looking at its contents. Those cards become the booster deck. You become the monarch. For the rest of the game, at the beginning of the monarch's end step, that player draws a card from the booster deck. They may spend mana of any type to cast those cards. (Then Planeswalk away from this phenomenon.)

Whenever you attack, create a Pin token attached to target attacking creature you control. It's an Pin Aura enchantment with enchant creature and "Enchanted creature gets +1/+1."
Whenever Chaos ensues, each opponent loses X life, where X is the total number of pins attached to you and creatures you control. (This includes pins on your backpack.)

When you planeswalk here and at the beginning of your upkeep, fold this plane in half. Draw cards equal to the number of times it's been folded. If you can't fold it, planeswalk.
Chaos: Completely unfold this plane. Each opponent discards two cards.

Whenever you cast an animal spell, draw a card. (Animals are any non-human creature types that are animals in real life.)
Whenever Chaos ensues, create a token that's a copy of target creature you control, except it's a 1/1.

: Target opponent gains control of Mindslaver Toolkit.
, : Choose any number —
• You lose X life.
• You discard X cards.
• You sacrifice X permanents.

Nonbasic lands are Wastes.
Whenever you tap a permanent for , add an additional .
Whenever chaos ensues, choose one —
• Draw four cards.
• Destroy target permanent.
• You may return target creature card from your graveyard to the battlefield.

Whenever you planeswalk here and at the beginning of your upkeep, exile the top card of your library. You may play that card this turn.
Whenever Chaos ensues, exile the top six cards of your library. An opponent or player outside the game chooses a nonland card with their favorite art. Then you may cast that spell without paying its mana cost.

No Way Out enters with three dread counters.
You can never leave — If a player would planeswalk while this plane has dread counters, chaos ensues instead.
Whenever you roll the planar die, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Whenever Chaos ensures each player may turn a face-down permanent they control face-up. Remove a dread counter from this plane.

Whenever you planeswalk here and at the beginning of your upkeep, create an Elvish Impersonators token. (It's a Elf creature with "As this creature enters, roll a six-sided die twice. Its base power becomes the first result and its base toughness becomes the second result.").
Thank you very much—Whenever Chaos ensues, target Elvish Impersonators becomes a 6/6. Its controller creates a Treasure token.

Whenever a player draws their second card each turn, any of their opponents may say "DRAW!". The first opponent to do so clashes with that player. The player that wins the clash creates two 1/1 black Assassin creature tokens. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)
Whenever Chaos ensues, draw a card.

Artifacts are Foods in addition to their other types (They have ", , Sacrifice this artifact: You gain 3 life.")
Sacrifice three Foods: Add . Activate only once each turn and only during your turn.
Chaos: You become the Monarch. If you are already the Monarch, draw a card.

Cards in each player's hand have cycling .
Chaos: Until end of turn, creatures you control have "This creature gets +1/+1 for each card you've discarded this turn."

When you planeswalk here, each player chooses a creature they control and creates a token that's a copy of it, except it's a Reflection in addition to its other types.
All Reflections have shadow. (They can block or be blocked only by creatures with shadow.)
Whenever chaos ensues, create a token that's a copy of a creature you control, except it's a Reflection in addition to its other types.

When you planeswalk here, each player may search their library for a basic land card, put it into their hand, then shuffle.
Whenever you play a card from Foundations or a core set (including Alpha!), draw a card. Whenever chaos ensues, you gain life equal to the number of years you've played Magic, rounded up. Then planeswalk.

When you planeswalk here and at the beginning of your upkeep, put a flying counter on target nontoken creature you control without flying.
Whenever chaos ensues, exile target creature with flying. For as long as it remains exiled, its owner may cast it by paying rather than paying its mana cost.
When you planeswalk away from The Windy City, remove all flying counters from all creatures.

When you planeswalk here and at the beginning your upkeep, put a spooky counter on target creature you control.
Spooky creatures you control have +1/+1 and menace. (A creature is spooky if it has a spooky counter or it could be a horror movie monster.)
A Murder at Markov Manor - Whenever chaos ensues, target spooky creature you control bites target opponent or creature an opponent controls. (The creature deals damage equal to its power to the creature your opponent controls. You gain that much life.)

Whenever a player commits a crime, they may draw a card. (Targeting opponents, anything they control, and/or cards in their graveyard is a crime.)
Whenever chaos ensues, Tarnation deals 1 damage to any target.

When you planeswalk here, you become the Monarch.
Whenever Chaos ensues, each player may create two tapped treasure tokens. Each player who does can't attack you during their next turn.

When you encounter this, draw a card for each pin you are wearing and each Pin token attached to creatures you control. (This includes pins on your backpack.) (Then planeswalk away from this phenomenon.)

Whenever a player casts their commander or attacks with their commander, they may say "Only one may stand." If they do, that commander becomes a Knight in addition to its other types until a player planeswalks away from Game Knights Live.
Knights you control have double strike and trample.
Whenever chaos ensues, commanders you control can't be blocked this turn and gain "Whenever this creature deals combat damage to a player, draw a card" until end of turn.

Suspend 2— (Deep Dish Pizza has no mana cost and must be suspended.)
, Sacrifice Deep Dish Pizza: Gain 3 life, draw three cards, and Deep Dish Pizza deals 3 damage to each opponent.

At the beginning of your second main phase, if you control a tapped creature, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Whenever Chaos ensues, exile target creature. If it's an instant or sorcery, cast it without paying its mana cost. Otherwise put it onto the battlefield under its owner's control.

: Add .
: Add one mana of any color that shares a color with a permanent a player controls.
, , Sacrifice this land: You gain 3 life.

Whenever you planeswalk here and whenever a creature enters under your control, create a Food token.
Whenever you gain life, target opponent loses that much life.
Whenever Chaos ensues, you may sacrifice any number of artifacts or creatures. Draw that many cards and lose that much life.

Whenever you planeswalk here, each player searches their library for up to two basic land or Desert cards and puts them onto the battlefield tapped, then shuffles their library. If a Desert entered the battlefield under a player's control this way, they create a 1/1 black Snake creature token with deathtouch.
Whenever Chaos ensues, create X 1/1 black Snake creature token with deathtouch, where X is 1 plus the number of nonbasic land types among lands that player controls.