Emry, Lurker of the Loch, Intruder Alarm, and Hangarback Walker

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Intruder Alarm on the battlefield
• Hangarback Walker in the graveyard
• Emry does not have summoning sickness

Steps

1. Activate Emry by tapping it, allowing you to cast Hangarback Walker from your graveyard this turn
2. Cast Hangarback Walker by paying
3. Hangarback Walker enters the battlefield and dies as a state-based action due to having zero toughness
4. Intruder Alarm triggers, untapping all creatures
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of all creatures