Mimic Vat + Deceiver Exarch + Ashnod's Altar + Doubling Season
Mimic Vat
Deceiver Exarch
Ashnod's Altar
Doubling Season
Requires
Mimic Vat must be on the battlefield.
Deceiver Exarch must be in exile (exiled by Mimic Vat).
Ashnod's Altar must be on the battlefield.
Doubling Season must be on the battlefield.
Mana needed: 
Steps
- Activate Mimic Vat by paying , creating two token copies of Deceiver Exarch with haste.
- The Deceiver Exarch tokens enter the battlefield, untapping Mimic Vat and any other permanent you control.
- Activate Ashnod's Altar twice by sacrificing both Deceiver Exarch tokens, adding .
- Repeat.
Results
Infinite colorless mana. Infinite creature tokens with haste. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mana permanents you control can produce. Infinite sacrifice triggers. Infinite untap of permanents you control.