Stola, Fields of Brimstone

{t}: Add {r} or {g}. Activate only if Stola is
Modified.
{t}, Exile a card from your graveyard:
put a Rose counters on Stola. Then you
may remove X Rose counters from Stola. if
you do so, you may cast a spell with mana
value X or less Exiled with Stola without
paying its mana cost.