pokemon tcg mega brave booster box Amazon.com: Card Game (Japanese) Mega Rayquaza Collection Box Grab

I count both BB and WF combined as a special set (when it comes to the 144 AR 12 SAR and 3 BWR subset) even though I know they are not

Sure, why not

Fairy types are immune to Dragon types, meaning that they receive no damage: Dragon - Mythology and fables often depict Dragons as evil and Fairies as heroic

Ijigen no Keiyakusho (Dark Contract with the Different Dimension) Continuous Trap Card You can only use the (1)st and (3)rd effect of this cards name each once per turn

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So perhaps the question isn't 'why is this spiking' but 'why isn't this spiking harder?' One reason could be that many players aren't a fan of infinite turn combos