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After Sorin transforms, you can immediately use the -1 ability to dome the opponent for even more

That attack is incredibly powerful earlier in the game before your opponent Evolves all of their Pokmon, and it gives you time to ramp to a thick stack of Energy cards in your discard pile to hit hard with Ceruledge ex

Theres obvious utility there when you bring something like a Staff of Domination to life, but what Im most interested in is the fact that Agatha of the Vile Cauldron forgot to exclude mana abilities from her Honda Ford In-It-To-Win-It Summer Sales Event

Should you want to spend even more money, for whatever reason, Limited Edition Alpha copies are the best bet