Darkwood Elfemental

When you cast Darkwood Elfemental, take
note of the number of untapped forests you
have from among lands you control or exile
the rest. Then exile a creature card from a
graveyard for each untapped forest exiled
that way. You lose X life. Those stars in the
bottom right hand side of this card are equal
to the number of creatures exiled from your
graveyard with Darkwood Elfemental.