Mesmeric Fiend

When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card.

When this creature leaves the battlefield, return the exiled card to its owner's hand.

When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card until this creature leaves the battlefield.

Flying

When this creature enters, target opponent reveals their hand. You choose a noncreature, nonland card from it. Exile that card until this creature leaves the battlefield.

When this creature enters, exile up to two target cards from a single graveyard.

When this creature leaves the battlefield, return the exiled cards to their owner's graveyard.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

When this creature enters, exile target green or white creature an opponent controls.

When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Deathtouch

When this creature enters, target opponent reveals their hand. You may choose a nonland card from it. If you do, exile that card.

When this creature leaves the battlefield, the exiled card's owner creates an X/X white Spirit creature token, where X is the mana value of the exiled card.