!Claim the Firstborn

Sorcery

Gain control of target creature with mana value 3 or less until end of turn. Untap that creature. It gains haste until end of turn.

"The deal was struck and the favor had been done. And so, under the cover of night, the debt was paid."
—Tales of the Fae

2019-10-04 Claim the Firstborn can target any creature with mana value 3 or less, even one that's untapped or one you already control.
2019-10-04 Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.
2019-10-04 If a creature on the battlefield has {X} in its mana cost, X is considered to be 0.

mtg.wtf