Kaiser Black, the Usurper

{3}, Sacrifice a creature: Mill the top three cards into your library and create up to X 2/2 black Zombie tokens where X is how many cards you milled this turn. You may only activate this ability on your turn and on your post-combat
phase.
When you have 15 or more cards in your graveyard, you may instead cast spells and play lands from your graveyard. They have, "Pay 2 life