First printed in Fallout (2024)
All 4 prints
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Fallout (PIP) #117, 2024
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Fallout (PIP) #427, 2024
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Fallout (PIP) #645, 2024
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Fallout (PIP) #955, 2024
Rex, Cyber-Hound 
Legendary Artifact Creature — Robot Dog
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.
MTGO price: 0.2 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).
Combos
73 combos from Commander Spellbook, the most popular first.
- Infinite colored mana, Infinite colorless mana: Palladium Myr + Pili-Pala + Rex, Cyber-Hound
- Infinite colorless mana that can only be spent to activate abilities: Horseshoe Crab + Omen Hawker + Rex, Cyber-Hound
- Infinite colorless mana that can only be spent to activate abilities: Morphling + Omen Hawker + Rex, Cyber-Hound
- Infinite colorless mana that can only be spent to activate abilities: Omen Hawker + Rex, Cyber-Hound + Soliton
- Exile each opponent's library: Knacksaw Clique + Rex, Cyber-Hound + Steelswarm Operator
- Infinite colored mana, Infinite colorless mana that can't be spent to cast spells from your hand: Pili-Pala + Rex, Cyber-Hound + Vhal, Candlekeep Researcher
- Infinite colored mana, Infinite colorless mana: Kozilek's Channeler + Pili-Pala + Rex, Cyber-Hound
- Infinite landfall triggers, Infinite mana lands you control that enter the battlefield untapped can produce: Rex, Cyber-Hound + Trench Behemoth + Walking Atlas
- Infinite mana lands you control that enter the battlefield untapped can produce, Infinite landfall triggers: PuPu UFO + Rex, Cyber-Hound + Trench Behemoth
- Infinite colored mana, Infinite colorless mana: Metalworker + Pili-Pala + Rex, Cyber-Hound
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Not legal
- Legacy Legal
- Vintage Legal
- Pauper Not legal
- Future Standard Not legal
- Historic Not legal
- Timeless Not legal
- Alchemy Not legal
- Penny Dreadful Not legal
- Premodern Not legal
- Old School 93/94 Not legal
Singleton
- Gladiator Not legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Not legal
- PreDH Not legal
- Tiny Leaders Legal
- Oathbreaker Legal
- Brawl Not legal
- Standard Brawl Not legal
- Competitive Brawl Not legal