Obsidian Axe Warlord

Haste, menace
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't
block as long as it has a +1/+1 counter on it.)
Whenever Obsidian Axe Warlord attacks,
you may destroy target creature an opponent controls. If you do, lose life equal to it's toughness.