Twilight Drover + Ashnod's Altar + Chromatic Orrery

Twilight Drover
Ashnod's Altar
Chromatic Orrery

Requires
Twilight Drover must be on the battlefield. Ashnod's Altar must be on the battlefield. Chromatic Orrery must be on the battlefield. Twilight Drover has at least one +1/+1 counter on it. Mana needed: 3
Steps
  1. Activate Twilight Drover by paying 3 and removing a +1/+1 counter from it, creating two 1/1 Spirit creature tokens.
  2. Activate Ashnod's Altar twice by sacrificing the Spirit tokens, adding 4.
  3. When the Spirits die, Twilight Drover triggers twice, putting two +1/+1 counters on Twilight Drover.
  4. Repeat.
Results
Infinite +1/+1 counters on Twilight Drover. Infinite colored mana. Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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