Mikaeus, the Unhallowed, Putrid Goblin, and Viscera Seer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Putrid Goblin on the battlefield
• Viscera Seer on the battlefield

Steps

1. Activate Viscera Seer by sacrificing Putrid Goblin
2. Putrid Goblin dies, triggering its persist and undying abilities
3. Resolve the persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. Resolve the undying trigger, doing nothing
5. Resolve the Viscera Seer ability, causing you to scry 1
6. Activate Viscera Seer by sacrificing Putrid Goblin
7. Putrid Goblin dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it
8. Resolve the Viscera Seer ability, causing you to scry 1
9. Activate Viscera Seer by sacrificing Putrid Goblin
10. Putrid Goblin dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it
11. Repeat from step 5

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1