Metzokai, The Lost King

When Metzokai enters the battlefield create
two 1/1 black cleric creature tokens.
At the beginning of your upkeep, sacrifice a
creature, put a +1/+1 counter on Metzokai,
then put a number of cards from the top of your library into your graveyard equal to the number
of +1/+1 counters on Metzokai.
When Metzokai dies return target creature card
with converted mana cost 3 or less from your graveyard to the battlefield under your control.