Skeleton Ship, Intruder Alarm, Geralf's Mindcrusher, and Viscera Seer

Prerequisites

• Skeleton Ship on the battlefield
• Intruder Alarm on the battlefield
• Geralf's Mindcrusher on the battlefield
• Viscera Seer on the battlefield
• Skeleton Ship does not have summoning sickness
• Geralf's Mindcrusher does not have a +1/+1 counter on it

Steps

1. Activate Viscera Seer by sacrificing Geralf's Mindcrusher
2. Geralf's Mindcrusher dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. Geralf's Mindcrusher enters the battlefield, triggering itself and Intruder Alarm
4. Resolve the Geralf's Mindcrusher trigger, causing target player to mill five cards
5. Resolve the Intruder Alarm trigger, untapping all creatures
6. Resolve the Viscera Seer ability from step 1, causing you to scry 1
7. Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Geralf's Mindcrusher
8. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite mill
• Infinite sacrifice triggers
• Infinite scry 1
• Infinite self-mill
• Infinite untap of all creatures