Sen, The Dead King

+3: Summon 2 2/2 Skeleton Warriors. Exile a creature from your graveyard.
-1: Exile a creature from your graveyard. Then, create an X/Y Skeleton. Where X is the exiled creature's power. Where Y is is it's toughness.
-14: Create X 1/2 Skeleton Soldiers with Haste and Menace. Where X is the amount of creatures in your exile.