Flythax, the Primal Fear

Flying, menace, haste
Whenever a creature with greater power than Flythax, the Primal Fear dies put two +1/+1
counters on Flythax, otherwise put a +1/+1
counter on it.
Pay 3 life, {t}: Destroy target creature. If the
creature had 5 power or less, untap Flythax
and gain 3 life.