Scuttling Sliver, Trazyn the Infinite, Unnatural Selection, and Arc Reactor

Prerequisites

• Scuttling Sliver on the battlefield
• Trazyn the Infinite on the battlefield
• Unnatural Selection on the battlefield
• Arc Reactor in the graveyard

Steps

1. Activate Trazyn using Arc Reactor's ability by tapping it, adding Activate Unnatural Selection by paying , causing Trazyn to become a Sliver until end of turn
2. Activate Trazyn by paying , untapping it
3. Activate Trazyn using Arc Reactor's ability by tapping it, adding Repeat from step 3

Results

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