Decimated Woodlands

{t}: Add {g} to your mana pool. If three or more cards were exiled from graveyards this turn, instead add one mana of any type to your mana pool.
{g}{g}{t}, Sacrifice Decimated Woodlands: Each creature with power 2 or less gains "Sacrifice this creature: Gain 2 life." until end of turn.
Everyone is someone's prey.