Karn, the Great Creator 1/264 (War of the Spark)

Activated abilities of artifacts your opponents control can't be activated. +1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value. −2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.

NM - $4.60
LP - $3.70
MP - $2.80
HP - $1.90
DMG - $1.50