Mimic

Abjure {x}(You may have an opponent cast target
noncreature, nonartifact spell in their graveyard with
a converted mana cost X or greater for {0}, then exile
it to reduce this creature's mana cost by {x}.)
Flash
Mimic comes into play as a copy of a noncreature artifact an opponent controls with a converted
mana cost X, except it's a creature with power
and toughness equal to X. Exile that artifact as
long as Mimic is in play.