xy steam siege booster box Pokémon TCG: XY: Long years of stability come to an end when Shiny Mega Gardevoir Pokemon - XY Steam Siege

I'll save you the trouble of going through and calculating the average CMC for a bunch of different lists

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I have no idea whether or not this will happen in practice, but Glorious End is an interesting effect that didn't exist in Modern before, so it's likely worth considering, at the very least

Emrakul is another odd one, she has some synergies with the Eldrazi package but only minor ones and while, like Worldbreaker, she is a card you can play independently of the tribe she does still require a lot of delirium style support