Scuttling Sliver, Trazyn the Infinite, Grim Monolith, and Imagecrafter

Prerequisites

• Scuttling Sliver on the battlefield
• Trazyn the Infinite on the battlefield
• Grim Monolith in the graveyard
• Imagecrafter on the battlefield

Steps

1. Activate Imagecrafter by tapping it, causing Trazyn to become a Sliver until end of turn
2. Activate Trazyn using Grim Monolith's ability by tapping it, adding
3. Activate Trazyn by paying , untapping it
4. Repeat from step 2

Results

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