Twilight Drover + Phyrexian Altar + Training Grounds

Twilight Drover
Phyrexian Altar
Training Grounds

Requires
Twilight Drover must be on the battlefield. Phyrexian Altar must be on the battlefield. Training Grounds must be on the battlefield. Twilight Drover has at least one +1/+1 counter on it. Mana needed:
Steps
  1. Activate Twilight Drover by paying and removing a +1/+1 counter from it, creating two 1/1 Spirit creature tokens.
  2. Activate Phyrexian Altar by sacrificing a Spirit, adding .
  3. When the Spirit dies, Twilight Drover triggers, putting a +1/+1 counter on itself.
  4. Repeat.
Results
Infinite +1/+1 counters on Twilight Drover. Infinite colored mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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