The Soulslayers

Flash
Flying
When The Soulslayers enters the battlefield, it
deals 5 damage to target attacking creature.
Whenever a creature dealt damage by The Soulslayers dies, put a +1/+1 counter on The Soulslayers.
It comes in taking a soul. It spends its time ending
lives. And just when you think you got it, it
slips away. Tell me, what do we do?
--Raphai, Man's Protector