Urza, Prince of Kroog, Grim Monolith, Mondrak, Glory Dominus, and Lightning Greaves

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Grim Monolith on the battlefield
• Mondrak, Glory Dominus on the battlefield
• Lightning Greaves on the battlefield
• available

Steps

1. Activate Grim Monolith's first ability by tapping it, adding
2. Activate Urza by paying , creating two token copies of Grim Monolith that are 1/1 Soldiers in addition to their other types
3. Activate Lightning Greaves' equip ability by paying , attaching it to a Grim Monolith token
4. Activate the Grim Monolith token's first ability by tapping it, adding
5. Repeat from step 3 using the other Grim Monolith token
6. Repeat from step 2

Results

• Infinite ETB
• Infinite tapped creature tokens