Type

Legendary Artifact Creature — Robot Dog

Oracle Text

Whenever Rex deals combat damage to a player, they mill two cards and you get {E}{E} (two energy counters).\nPay {E}{E}: Choose target creature card in a graveyard. Exile it with a brain counter on it. Activate only as a sorcery.\nRex has all activated abilities of all cards in exile with brain counters on them.