Incubation Druid + Marvin, Murderous Mimic + Simic Ragworm

GU identity

Commander legal

The 3 combo pieces

What must be in place

You control a land that can tap to produce {U}.
Marvin does not have summoning sickness and has at least one +1/+1 counter on it.

How to execute it

  1. Activate Marvin using Incubation Druid's ability by tapping it, adding {U}{U}{U}.
  2. Activate Marvin using Simic Ragworm's ability by paying {U}, untapping it.
  3. Repeat.

What the combo produces