Zaxara, the Exemplary, Necrotic Ooze, and Horseshoe Crab

Prerequisites

• Zaxara, the Exemplary in the graveyard
• Necrotic Ooze on the battlefield
• Horseshoe Crab in the graveyard
• Necrotic Ooze does not have summoning sickness

Steps

1. Activate Necrotic Ooze using Zaxara's ability by tapping it, adding
2. Activate Necrotic Ooze using Horseshoe Crab's ability by paying , untapping Necrotic Ooze
3. Repeat

Results

• Infinite colored mana