Skairon, Primeval Rage

: You may cast creature spells from your graveyard. Whenever you cast a creature spell this way, put a loyalty counter on Skairon, Primeval Rage.
-1: Sacrifice a creature, then put a creature card with equal or lesser mana value from your hand onto the battlefield.
-5: Put the top five cards of each player's library into their graveyard. You may cast creature spells without paying their mana costs this turn.