Amoeboid Changeling + Arc Reactor + Scuttling Sliver + Trazyn the Infinite

UB identity

Commander legal

The 4 combo pieces

• Amoeboid Changeling
• Arc Reactor
• Scuttling Sliver
• Trazyn the Infinite

How to execute it

1. Activate Amoeboid Changeling by tapping it, causing Trazyn to gain all creature types until end of turn
2. Activate Trazyn using Arc Reactor's ability by tapping it, adding {C}{C}{C}
3. Activate Trazyn by paying {2}, untapping it.
4. Repeat from step 2

What the combo produces

• Infinite colorless mana
• Infinite untap of some creatures you control