Activate Rex using Palladium Myr's ability by tapping it, adding {C}{C}.
Activate Rex using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Infinite colored mana

Infinite colorless mana

Rex, Cyber-Hound

Pili-Pala

Palladium Myr

Activate Rex using Omen Hawker's ability by tapping it, adding {C}{U} that can only be spent to activate abilities.
Activate Rex using Horseshoe Crab's ability by paying {U}, untapping it.
Repeat.

Infinite colorless mana that can only be spent to activate abilities

Omen Hawker

Horseshoe Crab

Activate Rex using Steelswarm Operator's second ability by tapping it, adding {U}{U} that can only be spent to activate abilities of artifact sources.
Activate Rex using Knacksaw Clique's ability by paying {1}{U} and untapping it, exiling the top card of an opponent's library with the ability to play that card this turn.
Repeat.

Exile each opponent's library

Knacksaw Clique

Steelswarm Operator

Activate Rex using Walking Atlas's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
Repeat.

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