Basri's Lieutenant + Metallic Mimic + Blasting Station

Basri's Lieutenant
Metallic Mimic
Blasting Station

Requires
Basri's Lieutenant must be on the battlefield. Metallic Mimic must be on the battlefield. Blasting Station must be on the battlefield. You control at least one additional creature that has a +1/+1 counter on it. "Knight" chosen with Metallic Mimic.
Steps
  1. Activate Blasting Station by tapping it and sacrificing another creature with a +1/+1 counter on it.
  2. When the creature dies, Basri's Lieutenant's second ability triggers, creating a 2/2 Knight creature token that enters the battlefield with a +1/+1 counter due to Metallic Mimic.
  3. When the Knight enters the battlefield, Blasting Station triggers, untapping itself.
  4. Resolve the Blasting Station ability from step 1, dealing 1 damage to any target.
  5. Repeat.
Results
Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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