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If you want to use a Team Rocket's Mewtwo ex deck, you're going to need Team Rocket's Spidops to maximize its effectiveness

Except for the fact that they can STILL Special Summon, so no worries, to your opponent

Since Ghalta costs X less to cast, where X is the total power of Creatures you control, your normal Green game plan of playing mana dorks and cheap, oversized Creatures naturally brings this cost down early

Maybe there's another Blazing Shoalbased deck or combo that could be scary, although it seems like it would have the same problem as Shoal Infect (needing to play a bunch of expensive, uncastable cards to make Blazing Shoal work)