Kuukai, Finder of Karma: Blocker (Whenever an opponent's creature attacks, you may tap this creature to stop the attack. Then the 2 creatures battle.) Evolution-Put on one of your Mecha Thunders. Whenever this creature blocks, untap it after it battles. This creature can't attack players.
Blocker (Whenever an opponent's creature attacks, you may tap this creature to stop the attack. Then the 2 creatures battle.)