Horseshoe Crab + Ilysian Caryatid + Marvin, Murderous Mimic

GU identity

Commander legal

The 3 combo pieces

• Horseshoe Crab
• Ilysian Caryatid
• Marvin, Murderous Mimic

What must be in place

You control a creature with power 4 or greater.
Marvin does not have summoning sickness.

How to execute it

1. Activate Marvin using Ilysian Caryatid's ability by tapping it, adding {U}{U}.
2. Activate Marvin using Horseshoe Crab's ability by paying {U}, untapping it.
3. Repeat.

What the combo produces

• Infinite colored mana