Rex, Cyber-Hound (Extended Art) (PIP-427) - Fallout: (Extended Art)

Whenever Rex deals combat damage to a player, they mill two cards and you get (two energy counters).
Pay : 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.