Prototype Portal + Dross Scorpion + Arcbound Ravager + Su-Chi Cave Guard
Prototype Portal
Dross Scorpion
Arcbound Ravager
Su-Chi Cave Guard
Requires
Prototype Portal must be on the battlefield.
Dross Scorpion must be on the battlefield.
Arcbound Ravager must be on the battlefield.
Su-Chi Cave Guard must be on the battlefield.
Mana needed: 
Steps
- Activate Prototype Portal by paying and tapping it, creating a token copy of Su-Chi Cave Guard.
- Activate Arcbound Ravager by sacrificing Su-Chi Cave Guard.
- When Su-Chi Cave Guard dies, Su-Chi Cave Guard and Dross Scorpion trigger.
- Resolve the Su-Chi Cave Guard trigger, adding eight .
- Resolve the Dross Scorpion trigger, untapping Prototype Portal.
- Resolve the Arcbound Ravager ability, putting a +1/+1 counter on it.
- Repeat.
Results
Infinite LTB. Infinite ETB. Infinite sacrifice triggers. Infinite death triggers. Infinite +1/+1 counters on Arcbound Ravager.
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