Summon: Choose a card with cost 4 or more in the enemy hand. They can't play cards with that name while you have Valkyrie Justiciar.
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.
Summon - Does something when played