Crab Umbra + Myr Welder + Prismatic Geoscope

U identity

Commander legal

The 3 combo pieces

• Crab Umbra
• Myr Welder
• Prismatic Geoscope

What must be in place

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

How to execute it

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

What the combo produces

• Infinite colored mana