Trazyn the Infinite, Grim Monolith, and The Eternity Elevator

Prerequisites

• Trazyn the Infinite on the battlefield
• Grim Monolith in the graveyard
• The Eternity Elevator in the graveyard

Steps

1. Activate Trazyn using The Eternity Elevator's ability by tapping it, adding at least twenty mana of any color
2. Activate Trazyn using Grim Monolith's ability by paying , untapping Trazyn
3. Repeat

Results

• Infinite colored mana
• Infinite colorless mana