Metalworker + Pemmin's Aura + Gemstone Array

Metalworker

Pemmin's Aura

Gemstone Array

How it works

1. Activate Metalworker by tapping it, causing you to reveal at least two artifact cards from your hand and add at least CCCC.
2. Activate Gemstone Array's first ability by paying 2, 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.

This fascinating loop turns Metalworker into an absolute mana factory by leveraging a pair of enchantments and artifacts to break the tap-ability bottleneck. As long as you have at least two artifact cards in your hand to reveal, Metalworker generates a massive surplus of colorless mana far exceeding its activation costs. You funnel that raw energy into Gemstone Array, paying two generic mana to store charge counters and then stripping them away to filter your mana into pure blue. That blue mana directly pays for Pemmin's Aura's untap ability, freeing Metalworker to tap all over again and scale your fortunes toward infinity.