Hidetsugu, Devouring Chaos, Intruder Alarm, Mortuary, and Endless One

Prerequisites

• Hidetsugu, Devouring Chaos on the battlefield
• Intruder Alarm on the battlefield
• Mortuary on the battlefield
• Endless One in hand
• Hidetsugu does not have summoning sickness
• Creatures you control can tap to produce at least

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least
2. Cast Endless One by paying
3. Endless One enters the battlefield and dies as a state-based action due to having zero toughness
4. Intruder Alarm and Mortuary trigger
5. Resolve the Intruder Alarm trigger, untapping all creatures
6. Resolve the Mortuary trigger, putting Endless One on top of your library from your graveyard
7. Activate Hidetsugu's second ability by paying and tapping it, exiling Endless One from the top of your library and allowing you cast it this turn
8. Repeat

Results

• Infinite +1/+1 counters on Endless One
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of all creatures