Grumgully, the Generous, and Aerie Ouphes

Prerequisites

• Grumgully, the Generous on the battlefield
• Aerie Ouphes on the battlefield
• Aerie Ouphes does not have a -1/-1 counter on it
• There is a creature with flying on the battlefield

Steps

1. Activate Aerie Ouphes by sacrificing it, targeting any creature with flying
2. When Aerie Ouphes dies, its persist ability triggers, returning it from your graveyard to the battlefield with no -1/-1 counter on it due to Grumgully the Generous
3. Holding priority, repeat from step 1
4. Resolve all Aerie Ouphes abilities, dealing infinite damage to the targeted creature(s)

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers