Liliana, Self-Fulfilled

: Creatures you control have +1/+1 for each different converted mana cost of permanents you control.
+1: Put target creature with converted mana cost 4 or less from your graveyard on the battlefield. You may sacrifice that creature and gain 2 life.
-X: Put all creatures from all graveyards onto the battlefield under your control. X is equal to the number of creatures returned this way.