Quillspike + Phyrexian Altar + Rendclaw Trow

Quillspike
Phyrexian Altar
Rendclaw Trow

Requires
Quillspike must be on the battlefield. Phyrexian Altar must be on the battlefield. Rendclaw Trow must be on the battlefield. Rendclaw Trow does not have a -1/-1 counter on it.
Steps
  1. Activate Phyrexian Altar by sacrificing Rendclaw Trow, adding bg.
  2. When Rendclaw Trow dies, its persist ability triggers, returning it to the battlefield from your graveyard with a -1/-1 counter on it.
  3. Activate Quillspike by paying bg and removing the -1/-1 counter from Rendclaw Trow, giving Quillspike +3/+3 until end of turn.
  4. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinitely large Quillspike until end of turn. Infinite sacrifice triggers.

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