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Unholy Annex // Ritual Chamber Phyrexian Arena, but with a significant upside (you don't even need to lose life!)

Instead you're given the pieces and you have to put them together to get the item(s)

Announce Important Plays Commander boards become crowded

Not only is the card visually stunning, but it can also be used effectively in many decks

Youre mostly countering spells on your opponents turns anyways, and in a multiplayer formats, youve got several turns that arent yours where you could use Force of Negation

Six is incredible, self-milling to fill up the graveyard on attacks, and retracing permanent spells during your turn