Stolen by the Fae {X}{U}{U}

Sorcery

Return target creature with mana value X to its owner’s hand. You create X 1/1 blue Faerie creature tokens with flying.

Faces, Tokens, & Other Parts
Faerie Token, TELD #5
Stolen by the Fae, ELD #348

Prints	USD	EUR	TIX
Foundations Jumpstart
Bloomburrow Commander	$0.09	€0.16	0.18
Jumpstart 2022	$0.22	€0.24
Throne of Eldraine Promos #66p	$0.50	€0.42
Throne of Eldraine Promos #66s	✶ $1.86
Throne of Eldraine #66	$0.29	€0.23	0.02
Throne of Eldraine #348	$1.66	€0.64
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If a creature on the battlefield has {X} in its mana cost, X is considered to be 0. (2019-10-04)

If the target creature is an illegal target by the time Stolen by the Fae tries to resolve, the spell won't resolve. You won't create any Faerie tokens. (2019-10-04)