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He has the powerful Eminence ability, which triggers even when he's in the Command Zone to pressure board states

You have to have a deck of 99 cards plus your commander

Phyrexian Metamorph Phyrexian Metamorph was once the undisputed best clone in Commander, but 10+ years of set releases have provided competition

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Discard or sacrifice Dragons proactively so Rivaz always has strong reanimation targets ready

While history isn't a perfect predictor of the future, it's worth pointing out that there are a lot of similarities between Hour of Devastation and Dragons of Tarkir , even beyond the sets' expected values