Necrotic Ooze, Cinderhaze Wretch, and Morselhoarder

Prerequisites

• Necrotic Ooze on the battlefield
• Cinderhaze Wretch in the graveyard
• Morselhoarder in the graveyard

Steps

1. Activate Necrotic Ooze by putting a -1/-1 counter on it, untapping it
2. Activate Necrotic Ooze by removing a -1/-1 counter from it, adding one mana of any color
3. Repeat

Results

• Infinite colored mana