Genju of the Fens [Betrayers of Kamigawa]

Enchant Swamp
2: Until end of turn, enchanted Swamp becomes a 2/2 black Spirit creature with "B: This creature gets +1/+1 until end of turn." It's still a land.
When enchanted Swamp is put into a graveyard, you may return Genju of the Fens from your graveyard to your hand.