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increase its Level by 1 and ATK by 300

Summon Create Phobos, a legendary 3/2 red Horse creature token

In the past, the only thing we had to do this was Strength Charm (which was only ever really played in Ludicolo DX/Magcargo DX)

They are: Arboliva ex Team Rocket's Moltres ex Cetitan ex Giovanni's Mewtwo ex Regirock ex Team Rocket's Crobat ex Giovanni's Nidoking ex Giovanni's Persian ex With Mewtwo, Crobat, Nidoking, Persian, and Crobat all being popular Pokemon, the possibilities are endless, and all eyes will be on the inevitable secret rare Mewtwo

So this sounds like it could be really strong in theory, because even if the enemy gains 500LP, this card can out damage that