Trazyn the Infinite, Empowered Autogenerator, and Grim Monolith

Prerequisites

• Trazyn the Infinite on the battlefield
• Empowered Autogenerator in the graveyard
• Grim Monolith in the graveyard

Steps

1. Activate Trazyn using Empowered Autogenerator's ability by tapping it, putting a charge counter on Trazyn and adding one mana of any color for each charge counter on it
2. Activate Trazyn using Grim Monolith's ability by paying , untapping Trazyn
3. Repeat

Results

• Infinite colored mana
• Infinite colorless mana