Precursor Golem, Jeskai Charm, Ephemeral Shields, and Arcbond

Prerequisites

• Precursor Golem on the battlefield
• Jeskai Charm in hand
• Ephemeral Shields in hand
• Arcbond in hand
• an additional Golem on the battlefield
• available

Steps

1. Before damage cast Ephemeral Shields, targeting any of the golems
2. Precursor Golem's ability triggers, copying Shields to the other golems and giving each indestructible until the end of turn
3. Cast Jeskai Charm, choosing the mode to give your creatures lifelink until the end of turn
4. Cast Arcbond, targeting one of the golems
5. Precursor Golem's ability triggers, copying Arcbond onto the other golems
6. Once a Golem takes damage, the ability given by Arcbond triggers, reflecting the damage onto all players and all other creatures
7. Because of lifelink, you gain life while all other players lose life
8. As the ability deals damage to the other golems, their Arcbond abilities trigger in response, doing the same

Results

• Infinite damage