Flying Wyvern Hunter

Put a +1/1 counter on Flying Wyvern Hunter
whenever a Flying Wyvern is killed
Flying Wyvern Hunter gets +1/+1 for each
Flying Wyvern controlled by an opponent.
{3}{r/w}: Deal 5 damage to target Flying Wyvern
{4}{r/w}{r/w}: Destroy target Flying Wyvern