Olivia, Mobilized for War, Grimgrin, Corpse-Born, and Doom Weaver

Prerequisites

• Olivia, Mobilized for War on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Doom Weaver on the battlefield

Steps

1. Activate Grimgrin by sacrificing the persist creature
2. When the persist creature dies, it and Doom Weaver trigger
3. Resolve the Doom Weaver trigger, causing you to draw a card
4. Resolve the persist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. When the persist creature enters the battlefield, Doom Weaver and Olivia trigger
6. Resolve the Doom Weaver ability, pairing it with the persist creature
7. Resolve the Olivia trigger, putting a +1/+1 counter on the persist creature and causing you to discard a card
8. Remove a +1/+1 counter and a -1/-1 counter from the persist creature as a state-based action
9. Resolve the Grimgrin ability
10. Repeat

Results

• Infinite draw triggers
• Infinite looting
• Infinite self-discard triggers
• Near-infinite +1/+1 counters on a creature
• Near-infinite creature ETB
• Near-infinite creature LTB
• Near-infinite creature sacrifice triggers
• Near-infinite death triggers