Dietzel Arcuate Seeker

Flying, hexproof
Whenever you cast a spell with a converted mana
cost of 2, put the top card of your library into
your graveyard.
Whenever you cast a spell with a converted mana
cost of 3, exile target card from your graveyard.
Whenever you cast a spell with a converted mana
cost of 4, return a card you own from exile to
your hand.