Quillspike, Phyrexian Altar, and Lingering Tormentor

Prerequisites

• Quillspike on the battlefield
• Phyrexian Altar on the battlefield
• Lingering Tormentor on the battlefield
• Lingering Tormentor does not have a -1/-1 counter on it

Steps

1. Activate Phyrexian Altar by sacrificing Lingering Tormentor, adding
2. When Lingering Tormentor 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 and removing the -1/-1 counter from Lingering Tormentor, 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