Infinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite storm countInfinite untap of creatures
How it works
Activate Elvish Piper by paying and tapping it, putting any creature card from your hand onto the battlefield.
The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Activate Phyrexian Altar by sacrificing the creature, adding .
The creature dies, triggering Enduring Renewal, returning the creature from your graveyard to your hand.