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By forcing players to give up a turn in order to get one, no matter what tricks they use, Time Vault was no longer a threat to existence itself and was brought back from exile

Theres also the option of forgoing the Diviner of the Herald package and adding in something like Adventurer, so Lava Golem acts as a secondary means to deal with Kashtira, though that again depends on meta

Barbaracle Ability: Lost Block Your opponent puts any Prize cards they would take in the Lost Zone instead of into their hand

"Mugen" means "Infinity" you see, hence why you fight him in Infinity Mountain/Tower and his finisher is "Infinity Cannon"