If an opponent would create one or more tokens, they create half that many of each of those kinds of tokens instead, rounded down.
If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

Companion — Your starting deck contains no cards with a silver, gold, orange, or purple expansion symbol. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)
When Lutri, Pauper Otter enters the battlefield, discard your hand, then draw three cards.

First strike, vigilance
Heroic — Whenever you cast a spell that targets Anax and Cymede & Kynaios and Tiro, draw a card. Each player may put a land card from their hand onto the battlefield, then each opponent who didn't draws a card.

The player who wins this game also wins the match. (A player may concede the game at any time. If the game ends while this spell is on the stack, it never resolves.)
Cycling

When Liliana's Other Contract enters the battlefield, you draw three cards and you lose 3 life.
If you would lose the game, instead exile Liliana's Other Contract, then return it to the battlefield transformed under your control.

Reach
When Flavor Disaster enters the battlefield or when it's turned face up, target creature gets +X/+X until end of turn, where X is Flavor Disaster's power.
Negamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its negamorph cost and put a -1/-1 counter on it.)

Flying, trample, protection from Angels and from Archons
Players can't gain life.
When Balefang enters, target opponent creates a tapped Baneslayer Angel token. The token is goaded for the rest of the game. (It's a 5/5 Angel creature with flying, first strike, lifelink, and protection from Demons and from Dragons.)

+1: Create two tapped Powerstone tokens. (They're artifacts with ": Add . This mana can't be spent to cast a nonartifact spell.")
−X: Untap X target artifacts.
−6: Search your library for an artifact card, put it onto the battlefield, then shuffle.
Dyfed, the Guiding Hand can be your commander.

Rulebreaker — A deck with this commander can have Angel cards of any color identity and any basic land cards.
Flying
Whenever Seluma deals combat damage to a player, return target Angel creature card from your graveyard to the battlefield.

Each nontoken creature you control that wasn't cast from your hand enters with two additional +1/+1 counters on it.
+1: Exile up to one other target permanent you control. At the beginning of the next end step, return that card to the battlefield under its owner's control.
−2: For each opponent, return up to one target nonland permanent that player controls to its owner's hand.
Venser, Visionary Traveler can be your commander.

Whenever an artifact is put into a graveyard from the battlefield, put a number of +1/+1 counters equal to that artifact's mana value on Joven and Chandler.
, : Gain control of target artifact until end of turn. Untap it. It gains haste until end of turn.

+2: Create a 2/2 black Zombie creature token.
0: You may sacrifice a creature. If you do, add .
−5: Create a Lord of the Pit token. (It's a 7/7 Demon creature with flying, trample, and "At the beginning of your upkeep, sacrifice another creature. If you can't, this token deals 7 damage to you.")
Thomil, the Destroyer can be your commander.

Hexproof
When Autumn Willow enters, create a 1/1 green Forest Dryad land creature token. (It's affected by summoning sickness.)
Whenever you tap a land creature for mana, add an additional .

+2: Arzakon deals 3 damage to any other target.
−3: Create a Black Lotus token. (It's a artifact with ", Sacrifice this token: Add three mana of any one color.")
−7: Each player shuffles their hand and graveyard into their library, then draws seven cards.
Arzakon can be your commander.

Menace
At the beginning of your end step, target opponent may draw four cards. If they do, look at that player's hand and you may cast a spell from their hand without paying its mana cost. If they don't, put two +1/+1 counters on Kuroki.

Trample, hexproof, indestructible

Protection from red
Whenever you cast your first spell during each opponent's turn, draw three cards, then put two cards from your hand on top of your library in any order.

Trample, indestructible
When Tresserhorn's Lord enters, sacrifice him unless you sacrifice three creatures, pay 3 life, and have target opponent draw three cards.
Whenever you sacrifice a creature, draw a card.

Whenever a creature dies, target opponent loses 1 life and you gain 1 life.
+1: Goad up to two target creatures.
−6: Each opponent exiles the top two cards of their library. Until end of turn, you may play those cards without paying their mana costs.
Sifa Grent can be your commander.

Flying, vigilance

Choose up to five worth of modes. You may choose the same mode more than once.
— Target creature gets +1/+0 and gains deathtouch until end of turn.
— Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control."
— Destroy each non-Zombie creature with power 3 or less.

You may play cards as though they were other cards of your choice with the same mana cost. You can't choose the same card twice. (Mana cost includes color.)

During each player's upkeep, that player exchanges control of random target artifact, creature or land he or she controls, for control of random target permanent of the same type that a random opponent controls.

, : Choose a random summon card from all players' decks. For each player, flip a coin. If the flip ends up heads, put a token creature into play and treat it as though an exact copy of the chosen summon card were just played.

Cannot be the target of spells or effects. World Champion has power and toughness equal to the life total of target opponent.
: Discard your hand to search your library for 1996 World Champion and reveal it to all players. Shuffle your library and put 1996 World Champion on top of it. Use this ability only at the beginning of your upkeep, and only if 1996 World Champion is in your library.

Sacrifice two lands: Return this card from your graveyard to the battlefield. Activate only during your upkeep and only if you control a Swamp.

Each creature you control that's a Clamfolk, Crab, Crocodile, Fish, Homarid, Jellyfish, Kraken, Leviathan, Lobster, Merfolk, Nautilus, Octopus, Otter, Oyster, Seal, Serpent, Shark, Shrimp, Sponge, Squid, Starfish, Trilobite, Turtle, Walrus, or Whale gets +2/+2.
At the beginning of your upkeep, if you control twelve different creatures from the above list and don't control a Brushwagg, you win the game.

Flying, haste, protection from red
, : Return target legendary creature card from your graveyard to the battlefield.
Tap six untapped creatures you control: Return The Cinematic Phoenix from your graveyard to the battlefield. If you tapped six legendary creatures this way, you win the game.

Flying
When Kharis & The Beholder enters and at the beginning of your upkeep, create a 1/1 white Human creature token and make a charisma check. (Roll a d20.)
• If the result plus the number of creatures you control is greater than 11, put a +1/+1 counter on each creature you control.
• If the result is a natural 20, for each nonlegendary creature you control, create a token that's a copy of that creature.

: Turn target permanent you control to its other face.
: Until end of turn, Optimus Prime, Inspiring Leader becomes a Construct with base power and toughness 6/6 and creatures you control gain trample.

+2: Draw two cards, then discard a card.
−2: Look at the top two cards of each other player's library, then put any number of them on the bottom of that library and the rest on top in any order. Scry 2.
−4: You get an emblem with "Your opponents play with their hands revealed" and "Whenever an opponent draws a card, this emblem deals 1 damage to them."

Create a Character (Any nonlegendary creature can choose this as its Background. It becomes legendary and can be your commander.)
Commander creatures you own are Clerics, Rogues, Warriors, and Wizards in addition to their other types.
As long as you have a full party, if an ability of a creature you control triggers, that ability triggers an additional time.

+1: Create a 1/1 Human Wizard creature token that's all colors.
−3: Choose a card name from among Enlightened Tutor, Mystical Tutor, Booster Tutor, Imperial Recruiter, and Worldly Tutor. Create a copy of the card with the chosen name. You may cast the copy without paying its mana cost.
−8: You get an emblem with "At the beginning of your upkeep, if you control twenty or more Wizards, you win the game."
Ersta, Friend to All can be your commander.

Flash
Flying, trample, haste
When Nira, Hellkite Duelist enters, the next time you would lose the game this turn, instead draw three cards and your life total becomes 5.

Vigilance (Attacking doesn't cause this creature to tap.)
: Draw a card.

Flying
At the beginning of your end step, draw a card. Then each opponent faces a villainous choice — That player discards a card, or you may put a Construct, Robot, or Vehicle card from your hand onto the battlefield.