Magmatic Galleon, Ghirapur Aether Grid, and Mondrak, Glory Dominus

Prerequisites

• Magmatic Galleon on the battlefield
• Ghirapur Aether Grid on the battlefield
• Mondrak, Glory Dominus on the battlefield
• An opponent controls an indestructible creature, or you have a way to give an opponent's creature indestructible
• You control a number of artifacts greater than two times the indestructible creature's toughness

Steps

1. Give an opponent's creature indestructible, if needed
2. Activate Ghirapur Aether Grid by tapping two artifacts you control, dealing 1 damage to an indestructible creature an opponent controls
3. If the creature has less than 0 toughness, Magmatic Galleon's second ability triggers, creating two Treasure artifact tokens
4. Repeat from step 2

Results

• Infinite tapped Treasure tokens