Heinrich Kemmler

Lich master : Undead (Skeletons, Zombies, and Ghosts) you control get +1/+1.

{t}: Return a creature with power less then or equal to the number of undead you control from your graveyard to the battlefield.

Whenever a non-undead creature dies you may conjure a "Grave Guard" card to your hand.
If that creature was legendary, you may instead conjure a "Krell, Undead Champion" card to your hand.