Crab Umbra + Prismatic Geoscope + Trazyn the Infinite

UB identity

Commander legal

The 3 combo pieces

• Crab Umbra
• Prismatic Geoscope
• Trazyn the Infinite

What must be in place

There are at least four basic land types among lands you control

How to execute it

1. Activate Trazyn using Prismatic Geoscope's ability by tapping it, adding at least {3}{U}.
2. Activate Crab Umbra by paying {2}{U}, untapping Trazyn.
3. Repeat.

What the combo produces

• Infinite colored mana