If you regenerate that attacker before damage is dealt, it will still be considered an attacker unless the regeneration effect itself triggers at the exact moment lethal damage would be dealt
As a fellow Water Pokemon Master, it's an injustice I say
You can make it cheaper with Goreclaw, Terror of Qal Sisma, and it fits with commanders that let you replay lands from your graveyard, like Titania, Protector of Argoth
Walking Ballista Walking Ballista is one of the most combod cards in Commander right now
Playing to the theme of Paradox Pokemon, Professor Sadas Vitality lets you keep your Ancient Pokemon powered up by bringing back Basic Energies from your discard pile and attaching them to your Pokemon
If we get an English printing of a generations card with that Holo I may genuinely cry