Xorn, Black Market Tycoon, Umbral Mantle, and Krark-Clan Ironworks

Prerequisites

• Xorn on the battlefield
• Black Market Tycoon on the battlefield
• Umbral Mantle on the battlefield
• Krark-Clan Ironworks on the battlefield
• Umbral Mantle attached to Black Market Tycoon
• Black Market Tycoon does not have summoning sickness

Steps

1. Activate Black Market Tycoon by tapping it, creating two Treasure tokens
2. Activate Krark-Clan Ironworks by sacrificing both Treasure tokens, adding
3. Activate Black Market Tycoon by paying and untapping it, giving itself +2/+2 until end of turn
4. Repeat

Results

• Infinite colored mana
• Infinite colorless mana
• Infinitely large Black Market Tycoon until end of turn
• Infinite Treasure tokens