Horseshoe Crab, Illusionist's Bracers, and Karametra's Favor

Prerequisites

• Horseshoe Crab on the battlefield
• Illusionist's Bracers on the battlefield
• Karametra's Favor on the battlefield

Steps

1. Activate Horseshoe Crab by tapping it, adding
2. Activate Horseshoe Crab by paying
3. Illusionist's Bracers triggers, copying Horseshoe Crab's ability
4. Resolve the copy of Horseshoe Crab's ability, untapping it
5. Activate Horseshoe Crab by tapping it, adding one mana of any color
6. Resolve Horseshoe Crab's ability from step 2, untapping it
7. Repeat

Results

• Infinite colored mana