Wandering Undead - 1BB
Creature -- Zombie (U)
When Wandering Undead is put into a graveyard from play, you may remove another creature card in your graveyard from the game. If you do, return Wandering Undead to your hand.
Harbinger of Wrath - 4WW
Creature -- Angel (R)
When Harbinger of Wrath comes into play, you may sacrifice it. If you do, destroy all creatures. They can't be regenerated.
I think it's too easy to get the card from the grove. It's not hard to play 3 creatures in a single turn, especialy if you do it all at at once with Scatter the Seeds or such. I do like graft enchantments, kinda reminds me of Afiya Grove.