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If the exiled card doesn't have a mana cost, its mana value is 0

Kuja, Genome Sorcerer / Trance Kuja, Fate Defied Strangely enough, I rather think Kuja, Genome Sorcerer is the better half of this double-faced card

(9/24/2021) If your commander is under the control of another player as you cast Visions of Dominance using its flashback ability, that commander's mana value can be used to determine the value of X

In addition to taking away all the abilities of your opponents creatures, it also replaces itself upon entering the battlefield, and it is this clause which makes it very attractive in the value-oriented Modern environment