Bone Draped Challenger

Bone Draped Challenger gets +1/+0 for each
creature in your graveyard as long as its attacking.
At the beginning of your upkeep, if Bone Draped Challenger is in your graveyard, you may pay 4
life to return it to the battlefield tapped.
Lifelink (Damage dealt by this creature also causes
you to gain that much life.)