Retrofitter Foundry + Ashnod's Altar + Clock of Omens + Doubling Season
Retrofitter Foundry
Ashnod's Altar
Clock of Omens
Doubling Season
Requires
Retrofitter Foundry must be on the battlefield.
Ashnod's Altar must be on the battlefield.
Clock of Omens must be on the battlefield.
Doubling Season must be on the battlefield.
Mana needed: 
Steps
- Activate Retrofitter Foundry's second ability by paying and tapping it, creating two 1/1 Servo artifact creature tokens.
- Activate Clock of Omens by tapping the Servos, untapping Retrofitter Foundry.
- Activate Ashnod's Altar by sacrificing a Servo, adding .
- Repeat.
- Once you have infinite mana, you may instead use Retrofitter Foundry's first ability to untap it and get infinite untapped Servo tokens.
Results
Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mana artifacts you control can produce. Infinite sacrifice triggers. Infinite untap of artifacts you control.
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