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It can wipe the board or remove and exile opposing problems with ease, and it has access to lifegain to help ride out the game until it can combo off

You cant apply more than 1 Vitality Cheer Ability at a time

I set a monster, passed the turn to my opponent, and they then spent a ridiculous amount of time summoning monsters, sacrificing those monsters to play even more powerful monsters, and continuing that pattern until my side of the board was empty and their side had upward of 10,000 points of damage ready to be freely applied to my piddling 8,000-point life pool

Use its ability, and the game is over

Crobat Darkness HP130 Stage 2 Evolves from Golbat [C][C] Mad Echo: 50 damage