Axebane Guardian + Horseshoe Crab + Marvin, Murderous Mimic

GU identity

Commander legal

The 3 combo pieces

• Axebane Guardian
• Horseshoe Crab
• Marvin, Murderous Mimic

What must be in place

You control at least two creatures with defender.
Marvin does not have summoning sickness.

How to execute it

1. Activate Marvin using Axebane Guardian'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

• Infinite colored mana