Metalworker, and Umbral Mantle

Prerequisites

• Metalworker on the battlefield
• Umbral Mantle on the battlefield
• Metalworker does not have summoning sickness
• Umbral Mantle eqiupped to Metalworker
• 2 other artifacts in hand

Steps

1. Use Metalworker's mana ability to reveal 2 artifact cards from your hand to net a total of
2. Use to untap Metalworker with Umbral Mantle's ability, also giving it +2/+2
3. Repeat until you have infinite mana

Results

• Infinite colorless mana
• Metalworker with infinite power and toughness until the end of turn