Mewtwo EX Mewtwo EX is an incredibly strong card for several reasons
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Eventually, you'll run out, but the enchantment Abundance can combo with Cultivator Colossus to make sure that you'll clear all the lands out of your deck
This allows us to loop Acererak indefinitely, and if we send him through the Lost Mine of Phandelver, we get infinite drains to finish off our opponents
If Szarel leaves the battlefield at the same time as you sacrifice one or more other nontoken permanents during your turn (probably because you also sacrificed Szarel), its last ability triggers for each of those other nontoken permanents
Instead, I think it bodes well for the way Wizards of the Coast is handling this set that a Final Fantasy fan would be able to accurately predict what some of their favorite characters might do