Magmatic Galleon + Ghirapur Aether Grid + Parallel Lives

Prerequisites

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

Effects

• Infinite artifact ETB
• Infinite artifact tokens
• Infinite tapped Treasure tokens