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Until end of turn, if target player would draw a card, instead that player skips that draw and you draw a card.

Draw a card. Madness {U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Counter target spell with converted mana cost 3 or less. If that spell is countered this way, exile it instead of putting it into its owner's grave...

Flying {U}, Sacrifice Hydromorph Gull: Counter target spell that targets a creature you control.

If any source would deal 1 or more damage to a permanent or player this turn, it deals 2 damage to that permanent or player instead. Draw a card.

{U}, Sacrifice Hydromorph Guardian: Counter target spell that targets a creature you control.

Enchant creature Enchanted creature gets +1/+1 and has flying. Discard a card: Return enchanted creature to its owner's hand.

Put the top seven cards of your library into your graveyard. At the beginning of the next end step, exile seven cards from your graveyard.

Target player draws two cards. Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant green or white creature Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you discard a card."

{1}{U}, Discard a card: Draw a card. {1}{U}, Sacrifice Compulsion: Draw a card.

Counter target spell unless its controller pays {1} for each card in your graveyard. Madness {U} (If you discard this card, discard it into exile. ...

Return target creature and target land to their owners' hands.

At the beginning of your upkeep, put a shred counter on Cephalid Vandal. Then put the top card of your library into your graveyard for each shred c...

Sacrifice Cephalid Snitch: Target creature loses protection from black until end of turn.

Threshold — As long as seven or more cards are in your graveyard, Cephalid Sage has "When Cephalid Sage enters the battlefield, draw three cards, t...

Whenever Cephalid Illusionist becomes the target of a spell or ability, put the top three cards of your library into your graveyard. {2}{U}, {T}: P...

Whenever Cephalid Aristocrat becomes the target of a spell or ability, put the top two cards of your library into your graveyard.

Draw four cards, then choose X cards in your hand and discard the rest.

Discard a card: Switch Aquamoeba's power and toughness until end of turn.

{3}: Target player puts the top three cards of their library into their graveyard.

Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.) Flashback...

As an additional cost to cast this spell, discard X cards. Exile X target attacking creatures.

Flying {2}{W}, Discard a card: Aven Trooper gets +1/+2 until end of turn.