Hashaton, Scarab's Fist, Mind Over Matter, Astral Cornucopia, and Elvish Regrower

Prerequisites

• Hashaton, Scarab's Fist on the battlefield
• Mind Over Matter on the battlefield
• Astral Cornucopia on the battlefield
• Elvish Regrower in hand

Steps

1. Activate Astral Cornucopia by tapping it, adding at least
2. Activate Mind Over Matter by discarding Elvish Regrower
3. Hashaton triggers, causing you to pay to create a tapped token copy of Elvish Regrower that is a 4/4 Zombie
4. When the Elvish Regrower token enters the battlefield, it triggers, returning Elvish Regrower from your graveyard to your hand
5. Resolve the Mind Over Matter ability, untapping Astral Cornucopia
6. Repeat

Results

• Infinite ETB
• Infinite self-discard triggers
• Infinite tapped creature tokens