Metalworker, Pemmin's Aura, and Gemstone Array

Prerequisites

• Metalworker on the battlefield
• Pemmin's Aura on the battlefield
• Gemstone Array on the battlefield
• Pemmin's Aura attached to Metalworker
• Metalworker does not have summoning sickness
• You have at least two artifact cards in hand

Steps

1. Activate Metalworker by tapping it, causing you to reveal at least two artifact cards from your hand and add at least
2. Activate Gemstone Array's first ability by paying , putting a charge counter on it
3. Activate Gemstone Array's second ability by removing a charge counter from it, adding
4. Activate Pemmin's Aura's first ability by paying , untapping Metalworker
5. Repeat

Results

• Infinite charge counters on Gemstone Array
• Infinite colored mana
• Infinite colorless mana