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To pair up with those two cards, I made this. On one hand it sounds overpowered, on the other, I think it'll be very hard to use given that the opponent can play around it.
I wanted a 210 knock-out threshold to make Yveltal and Mewtwo pay two more energy for a one-shot, and 1 more for Mega-waifu. Maybe 180/30 or even 190/20 would be better than 170/40. I went with the extreme case for now just for the purpose of playing devil's advocate.
Either way, its not hard to beat with Primal Groudon, Yveltal, Mewtwo, Mega-Waifu, Donphan just plays around it with Sigilyph, Flareon is only worth one prize and can two-shot it in the worst of cases, Night March tends to do enough as well...
Primal Kyogre might have problems, but isn't without its tricks.
Lysandre laughs at it.
VirGen probably doesn't stand a chance but it's due for rotation anyway.
It might wall the player as much as the opponent. At 2 energy with Delphox and Valley it only deals as much damage as it has received, on average. It can be hard and risky to set up at the start, and once it sustains enough damage to hit hard, it is vulnerable to a revenge kill. In short, it's slow to build up power and hard to keep alive when it finally does.