Lifeforce: When you gain Health, Sadistic Valkyrie gets Lifesteal.
Card sounds may differ from in-game as they get updated.
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.
Lifeforce - Cards with Lifeforce have an effect when their owner gains health.