Amoeboid Changeling + Prismatic Geoscope + Scuttling Sliver + Trazyn the Infinite

UB identity

Commander legal

The 4 combo pieces

• Amoeboid Changeling
• Prismatic Geoscope
• Scuttling Sliver
• Trazyn the Infinite

How to execute it

1. Activate Amoeboid Changeling by tapping it, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Prismatic Geoscope's ability by tapping it, adding at least three mana of any color.
3. Activate Trazyn by paying {2}, untapping it.
4. Repeat from step 2.

What the combo produces

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