Horseshoe Crab + Marvin, Murderous Mimic + Sanctum Weaver

GU identity

Commander legal

The 3 combo pieces

What must be in place

You control at least two enchantments.
Marvin does not have summoning sickness.

How to execute it

  1. Activate Marvin using Sanctum Weaver's ability by tapping it, adding at least {U}{U}.
  2. Activate Marvin using Horseshoe Crab's ability by paying {U}, untapping it.
  3. Repeat.

What the combo produces