Entomb: Draw a curse from your void.
Entomb - The ability of a unit with Entomb will activate when it dies. This combines well with effects that sacrifice units as a cost.
Flying - Flying units can only be blocked by other flying units, but can block ground units normally. They can also be directly attacked by Killer units and Relic Weapons.
Lifesteal - Units and spells with Lifesteal give you health when they deal damage, healing you equal to the damage dealt.