Cthulhu

When Cthulhu enters the battlefield, choose a permanent type, and create 3 1/1 cultist tokens.
When a card of the chosen type enters the battlefield create a 1/1 cultist token.
{t}, Sacrifice a cultist: You may cast cards of the
chosen type from your graveyard, and those cards
cost {1} less until end of turn.
{t}, Sacrifice 10 cultists: return all cards of the
chosen type from all graveyard to your battlefield