The second is more relevant and it is that this is something you can win the game with on the spot
After his Support or Option effects are resolved, the battle begins and the damage are calculated to the Digimon's HP
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R Rare Performapal Bit Bite Turtle X WATER Level 3 [ ReptilePendulumEffect ] ATK 800 DEF 1200 P Scale 3 Once per turn: You can reveal 1 "Performapal" or "Odd-Eyes" monster in your hand, and if you do, reduce the Levels of monsters in your hand with that name by 1 for the rest of this turn (even after they are Summoned/Set, and even if this card leaves the field)
Im not convinced itll supplant Kumena, Tyrant of Orazca as the go-to best merfolk commander, but Im sure wherever you see one, youre bound to see the other (Kumenas actually in the precon!)
Playing a new one causes the previous one to be put in the graveyard