Counterspell

Fatal Push

Destroy target creature if it has mana value 2 or less.
Revolt — Destroy that creature if it has mana value 4 or less instead if a permanent you controlled left the battlefield this turn.

Unsummon

Return target creature to its owner's hand.

Poison the Cup

Destroy target creature. If this spell was foretold, scry 2.
Foretell {1}{B} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Cancel

Murder

Smother

Destroy target creature with mana value 3 or less. It can't be regenerated.

Negate

Island

Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.