Umbral Mantle, and Metalworker

Prerequisites

• Umbral Mantle on the battlefield
• Metalworker on the battlefield

Steps

1. Activate Metalworker by tapping it, revealing at least two artifact cards from your hand and adding at least
2. Activate Metalworker by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinite colorless mana
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn