absorb essence

enchant target players
when absorb essence enters the battlefield all
enchanted players mill 4 card
once per turn you may exile a card from each
enchanted player's graveyard if a creature was
exiled this way gain 1 life. if a land is exiled this
way add{b} if the exiled land is a forest instead
add one mana of any color. you don't lose this
mana in end of the turns.