Metalworker + Pemmin's Aura + Signpost Scarecrow

Metalworker

Pemmin's Aura

Signpost Scarecrow

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 Signpost Scarecrow by paying 2, adding .
3. Activate Pemmin's Aura's first ability by paying , untapping Metalworker.
4. Repeat.

This clever loop turns Metalworker into a massive mana engine by exploiting its heavy color-agnostic output, requiring you to reveal at least two artifacts from your hand to generate plenty of colorless mana. To turn those colorless resources into the specific colors needed to keep the machinery moving, Signpost Scarecrow steps in to filter that treasure into blue mana. Finally, Pemmin's Aura uses that blue energy to constantly untap Metalworker, resetting its tap ability so you can repeat the process indefinitely for infinite mana of any color.