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The phrase "that hasn't been chosen" refers only to that specific Silent Hallcreeper

Pairing with the five-mana artifact, The Mightstone and Weakstone, if you pay seven mana to active Urza's activated ability while this artifact is in play, these cards meld into Urza, Planeswalker, perhaps the most powerful Planeswalker card in Magic's history

(You see all cards that player could see and make all decisions for them.) Exile Secret of Bloodbending

The truth lies somewhere in the middle

Its ward ability keeps Sauron safe, demanding that opponents sacrifice a legendary artifact or creature to target him with spells or abilities -- the best iteration of ward that MTG has ever seen