Legendary Artifact Creature — Robot Dog
Rex, Cyber-Hound
Whenever Rex deals combat damage to a player, they mill two cards and you get {E}{E} (two energy counters). Pay {E}{E}: Choose target creature card in a graveyard. Exile it with a brain counter on it. Activate only as a sorcery. Rex has all activated abilities of all cards in exile with brain counters on them.
From Magic: The Gathering.
Exact printings
Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o55oj2n71pb1hpcpdil9w.