One of the most infamous examples of how overleveling can backfire is leveling too high in Chapter 1 will make random encounters in Chapter 2, when Red Chocobos start appearing, absolutely brutal (Red Chocobos, appearing once high enough level, can repeatedly use Chocobo Meteor with no cost nor charge time)
Italian Serpente Veleno Una volta per turno, puoi mettere 1 Segnalino Veleno su 1 mostro controllato dal tuo avversario
At the edge of the known Multiverse, a star system teeters on the brink of disaster
There's not much more to add, and it isn't even a very innovative take on a Hydra, but again, there simply wasn't a lot of competition
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Any competent deck could take this time to easily wipe their opponent out of existence