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While it might not seem significant in the long run, forcing your opponent to wait a turn to cast their spells gives you an extra turn or two to set up the board

The comp pool exists

it can OHKO almost everything in the format

If your opponent casts Murder on one of your creatures, you either prevent it from happening or get to do it to one of their creatures

Going Creatureless Dodging creature removal is great as it leaves dead cards in your opponents hand

Taking a cue from Mewtwo & Mew-GX [Unified Minds] decks from the past, this deck can copy Pokmon from your discard pile, and that gives Regidrago VSTAR more options than any other deck in format