Grenivix Nox, Gore Chanter

Whenever a nonland card is put into an opponent's graveyard, you may pay X life where
X is twice that card's converted mana cost and exile that card.
{t}, Choose a card exiled by Grenivix Nox, Gore Chanter, until end of turn, you may cast a copy
of that card and you may spend mana as though
it were mana of any color to cast it.
Power always has a price.