Spark: +4 Health.
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.
Reckless - Units with Reckless must attack.
Spark - Cards with Spark have an additional effect when played after the enemy player has taken damage this turn.