Great Garbage Crisis

Each creature card in your graveyard has scavenge. The scavenge cost is equal to its mana cost. (Exile a creature card from your graveyard and pay its mana cost: Put a mumber of +1/+I counters equal to that card's power on target creature. Scatenge only as a sorcery.)

{g}{g}, {t}: Double the amount of counters on target permanent.