Sliver Queen, Gemcutter Buccaneer, Krark-Clan Ironworks, and Xenograft

Prerequisites

• Sliver Queen on the battlefield
• Gemcutter Buccaneer on the battlefield
• Krark-Clan Ironworks on the battlefield
• Xenograft on the battlefield
• "Pirate" chosen with Xenograft
• available

Steps

1. Activate Sliver Queen by paying , creating a 1/1 Sliver creature token
2. When the Sliver enters the battlefield as a Pirate due to Xenograft, Gemcutter Buccaneer triggers, creating a tapped Treasure token
3. Activate Krark-Clan Ironworks by sacrificing the Treasure, adding
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB