Phyris, Natural Succession

Whenever a land is put into your graveyard
from anywhere, Phyris, Natural Succession
deals 2 damage to any target.
{1}{b}{r}{g}, Sacrifice Phyris and two other
creatures: Mill X, where X is equal to the
total damage dealt to your opponents this
turn, then return all land cards from your
graveyard to the battlefield tapped.