Slivers you control have hope. (Prevent all damage that would be dealt to attacking creatures with hope.)

Rulebreaker — If Tolabow, Loch Rascal is your commander, the color identity of instant and sorcery cards in your deck can include one color of your choice not in your commander's color identity, and your deck can have any basic land cards.
Whenever you cast an instant or sorcery spell, create a 1/1 blue and red Otter creature token with prowess. (Whenever you cast a noncreature spell, it gets +1/+1 until end of turn.)

, : Target permanent you control becomes the color of your choice. (This effect lasts indefinitely.)

Shuffle all cards in the game together and deal them into three decks. The game continues with a new player.

Counter target spell, then assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Freerunning (You may cast this spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or commander.)
Menace (This creature can't be blocked except by two or more creatures.)
Other Assassins you control get +1/+1.

Reach
Other Spiders you control get +1/+2.
, Exile two cards from your graveyard: Draft a card from Ishkanah, Broodmother's spellbook.

Whenever you cast a spell, you may gain ½ life for each word in that spell's name.

Whenever The Madcap Jester attacks, each opponent exiles the top card of their library.
Whenever a spell or ability you control causes one or more cards to be exiled from an opponent's library, you may play those cards until the end of your next turn. Mana of any type can be spent to cast spells this way.

Vigilance
When Casal enters, search your library for a Forest card, put it onto the battlefield tapped, then shuffle.
Whenever Casal attacks, you may pay . If you do, transform her.

Each spell you cast with a name printed in a Kamigawa expansion costs less to cast.
+2: Open up to one sealed Kamigawa booster pack and shuffle those cards into your booster pile. Look at the top four cards of your booster pile. Put two of those cards into your hand and the rest into your graveyard.
−3: Return a creature card with a name printed in a Kamigawa expansion from your graveyard to the battlefield.
Heroes of Kamigawa can be your commander.

Flying
Whenever a player attacks you, if that player has another opponent who isn't being attacked, prevent all combat damage that would be dealt to you this combat.

Shroud (This creature can't be the target of spells or abilities.)
Glimpse, the Unthinkable can't be chosen.
The name Glimpse, the Unthinkable can't be chosen.

When this creature enters, choose one —
• Another target Wolf or Werewolf you control fights target creature you don't control.
• You get a one-time boon with "When you cast a Wolf or Werewolf spell, it gains 'When this creature enters, it fights up to one target creature you don't control.'"

Enchant creature you control
Enchanted creature is a planeswalker in addition to its other types. Its toughness becomes its loyalty. (You change its toughness to activate loyalty abilities. Damage lowers toughness. Toughness doesn't heal at end of turn.) It can't block and gains the following abilities —
+1: Add .
−1: Exile the top card of your library. You may play it this turn.
−X: This planeswalker deals X damage to any target.

Whenever a land enters during your turn, put a +1/+1 counter on this creature.

, : Change the target of target spell with a single target if that target is you. The new target must be a player. X is twice the mana value of that spell.

, : Move the CRANK! counter to your Contraption deck's next sprocket and crank any number of that sprocket's Contraptions.

Eternal Flame deals X damage to target opponent or planeswalker and half X damage, rounded up, to you, where X is the number of Mountains you control.

This artifact enters tapped.
When this artifact enters, draft a card from this artifact's spellbook, then discard a card.
: Add two mana in any combination of colors.

As an additional cost to cast this spell, you may open a sealed Magic booster pack and put the cards on the bottom of your booster pile in a random order.
Spells you cast have booster cascade. (It's like cascade, but use your booster pile rather than your library.)

+1: Create a 2/2 red Gremlin creature token.
−2: Chandra, Gremlin Wrangler deals X damage to target creature or player, where X is the number of Gremlins you control.

Destroy all creatures. Creature cards in your hand perpetually get +1/+1.

Flying, deathtouch
When High Fae Prankster enters, choose up to one —
• Perpetually exchange target creature's base power with another target creature's base power.
• High Fae Prankster perpetually has base power and toughness 4/1.

Choose two —
• Counter target black-bordered spell.
• Return target creature to its owner's hand.
• Untap each permanent you control with a watermark.
• Roll two six-sided dice. Target player mills X cards, where X is the total of those results.

Haste
Whenever Ambergris, Agent of Destruction attacks, you may discard your hand and draw two cards. If you do, Ambergris deals X damage to each opponent, where X is the number of cards you've discarded this turn.

Whenever Water Weird deals combat damage to a player, put a +1/+1 counter on Water Weird if the top card of your library is a nonland card. Otherwise, you may mill a card.
: Water Weird gets +1/-1 until end of turn.

, : For one spell this turn, you may spend mana as though it were mana of any type to pay that spell's mana cost. (Additional costs are still paid normally.)

Flying, vigilance, prowess
: Draw a card. Activate only if you've cast a noncreature spell this turn.

Trample (This creature can deal excess combat damage to the player it's attacking.)
Whenever you attack, you may pay . When you do, target creature can't block this turn.

Green creatures can't attack unless their controller sacrifices a land of their choice for each green creature they control that's attacking. (This cost is paid as attackers are declared.)

Deal Damage deals 4 damage to any target.
Gotcha — If an opponent says "deal" or "damage," you may say "Gotcha!" When you do, return Deal Damage from your graveyard to your hand.

When this creature specializes, tap target nonland permanent an opponent controls. That permanent doesn't untap during its controller's untap step for as long as you control Lukamina, Crocodile Form.
When Lukamina, Crocodile Form dies, it unspecializes. If it unspecializes this way, return it to the battlefield tapped.

When this creature specializes, remove all study counters from it. When you do, Vhal, Scholar of Elements deals that much damage to target creature or planeswalker an opponent controls.
: Draw a card, then discard a card.

Flying
Whenever you attack with one or more other creatures with flying, you gain twice that much life.

First strike
: Target Dwarf creature gets +2/+0 and gains first strike until end of turn. When that creature leaves the battlefield this turn, sacrifice this creature. Activate only during combat.