Chalice of Nature

Whenever a player cast a spell, put a Nature counter on Chalice of Nature. Remove 2 Nature counter: Gain 1 life. Remove 3 Nature counter:
Add one mana of any color to your mana pool. Remove 4 Nature counter: Return target card
from your graveyard to your hand. Sacrifice Chalice: Choose one: Gain 2 lives, Add one
mana of any color to your mana pool or Return target card from your graveyard to your hand.