Vapor Snag

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

Burglar Rat

When Burglar Rat enters, each opponent discards a card.

Man-o'-War

When Man-o'-War enters, return target creature to its owner's hand.

Swamp

Faerie Seer

Ravenous Rats

When Ravenous Rats enters, target opponent discards a card.

Dispel

Mulldrifter

Flying
When Mulldrifter enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Wretched Gryff

Emerge {5}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, draw a card.
Flying

Cast Down

Counterspell

Wormfang Drake

Flying
When Wormfang Drake enters, sacrifice it unless you exile a creature you control other than Wormfang Drake.
When Wormfang Drake leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Phyrexian Rager

When Phyrexian Rager enters, you draw a card and you lose 1 life.

Island

Sea Gate Oracle

When Sea Gate Oracle enters, look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Echoing Decay

Target creature and all other creatures with the same name as that creature get -2/-2 until end of turn.