Arcbound Reclaimer, Showdown of the Skalds, Welding Jar, and Bolas's Citadel

Prerequisites

• Arcbound Reclaimer on the battlefield
• Showdown of the Skalds on the battlefield or in the graveyard
• Welding Jar in hand or in the library
• Bolas's Citadel on the battlefield

Steps

1. Cast Welding Jar either from your hand by paying or from the top of your library by paying 0 life
2. Showdown of the Skalds triggers, putting a +1/+1 counter on Arcbound Reclaimer
3. Activate Welding Jar by sacrificing it
4. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Welding Jar from your graveyard onto the top of your library
5. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite +1/+1 counters on Golems you control