In EDH it's impossible to play a 200+ card deck due to the rules of the format, but in its Standard format, Battle of Wits decks were somewhat competitive
The early version was what we might describe as slightly unbalanced. And that would be a wildly generous description
Just play it Giratina ex right away and use its ability to attach an additional energy on, turning a curse into a blessing
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Initially, Red-Eyes Dark Dragoon was the boss monster we used, but, at its peak, this "combo" used Destiny HERO - Destroyer Phoenix Enforcer, which dominated the meta in its golden age
Dispatcher Can I really put a card owned by my opponent into my hand