Requires

Myr Welder must be on the battlefield. Voltaic Construct must be in the graveyard. Prismatic Geoscope must be in the graveyard. Myr Welder does not have summoning sickness. You control at least three different basic land types. Mana needed:

Steps

1. Activate Myr Welder by tapping it, exiling Voltaic Construct from your graveyard.
2. Activate Myr Welder using Voltaic Construct's ability by paying , untapping Myr Welder.
3. Activate Myr Welder by tapping it, exiling Thran Dynamo from your graveyard.
4. Activate Myr Welder using Voltaic Construct's ability by paying , untapping Myr Welder.
5. Activate Myr Welder using Prismatic Geoscope's ability by tapping it, adding mana of any color equal to amount of basic land types you control.
6. Repeat from step 4.

Results