Emry, Lurker of the Loch, Intruder Alarm, and Walking Ballista

Prerequisites

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

Steps

1. Activate Emry by tapping it, allowing you to cast Walking Ballista from your graveyard this turn
2. Cast Walking Ballista by paying
3. Walking Ballista 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