Borys, Dragon of Tyr

Flying, haste

{b}{r},{t}, Sacrifice X creatures and/or lands: For every three lands sacrificed this way, you may cast a spell with mana value X or less from your hand or graveyard without paying. For every three creatures sacrificed this way, return a creature with mana value X or less from a graveyard to the battlefield under your control with a finality counter. Activate only as a sorcery.