Summon: Kill all enemy units with 3 Attack or less. Stun all other enemy units.
Card sounds may differ from in-game as they get updated.
Deadly - Units and spells with Deadly kill any unit they damage, regardless of health. For example, a 1/1 with Deadly can kill a 5/5 attacker.
Summon - Does something when played
Stun - Exhaust a unit. It can't attack or block next turn.