The Darkened vs. Flame-Pains

The Darkened: ({1}{b}{g}): Destroy target creature with power three or less. Target creature you
control gets +X/+X where X the destroyed creature's converted mana cost.
Flame-Pains: ({2}{b}{r}): Put a -1/-1 counter on each creature target player controls. Creatures
with -1/-1 counters on them can't block creatures you control.
(You may cast one war on this card as a sorcery. The first effect is immediate. The second