Alena, Kessig Trapper + Chromatic Orrery + Fain, the Broker + Robaran Mercenaries

RWB identity

Commander legal

The 4 combo pieces

• Alena, Kessig Trapper
• Chromatic Orrery
• Fain, the Broker
• Robaran Mercenaries

What must be in place

Robaran Mercenaries does not have summoning sickness.
You control a creature with power 5 or greater that entered the battlefield this turn.

How to execute it

1. Activate Robaran Mercenaries using Alena's ability by tapping it, adding at least {5}.
2. Activate Robaran Mercenaries using Fain's fourth ability by paying {4}, untapping Robaran Mercenaries.
3. Repeat.

What the combo produces

• Infinite colored mana