Arcbound Reclaimer, Showdown of the Skalds, Elsha of the Infinite, and Lion's Eye Diamond

Prerequisites

• Arcbound Reclaimer on the battlefield
• Showdown of the Skalds on the battlefield or in the graveyard
• Elsha of the Infinite on the battlefield
• Lion's Eye Diamond in hand or in the library

Steps

1. Cast Lion's Eye Diamond either from your hand or from the top of your library by paying Showdown of the Skalds and Elsha's prowess ability trigger
2. Resolve the Showdown of the Skalds trigger, putting a +1/+1 counter on Arcbound Reclaimer
3. Resolve the Elsha trigger, giving it +1/+1 until end of turn
4. Activate Lion's Eye Diamond by discarding your hand and sacrificing it
5. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Lion's Eye Diamond from your graveyard onto the top of your library
6. Repeat

Results

• Infinitely large Elsha of the Infinite until end of turn
• Infinite storm count
• Infinite colored mana