my hero academia league of villains booster box TCG Attacks with Echo can pay one momentum to “Echo” the attack My Hero Academia CCG Class

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(Sorry for that reminder!) Much like cycling, its name was chosen for a mechanical reason more than a flavorful one

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Make a creature of yours indestructible until end of turn if its about to be removed or die from combat damage

It takes a lot of mana and resources to get to, but you swing with your big dragons at a speed your opponent probably cant survive if it stays alive for a few turns

2 Immediate indications are the corners and the text at the bottom