Mordekaiser, Iron Revenant

Undying
Mordekaiser, Iron Revenant gains +1/+1 for each creature card in your graveyard.
{1}{b}{b}: Exile target creature from a graveyard. Until end of turn Mordekaiser, Iron Revenant gains +X/+Y, where X is the exiled creature card's power and Y is its toughness.