Solar Array + Pemmin's Aura + Karn, Silver Golem

Solar Array

Pemmin's Aura

Karn, Silver Golem

How it works

1. Animate Solar Array, if needed.
2. Cast Pemmin's Aura by paying its mana cost, attaching it to Solar Array.
3. Activate Solar Array by tapping it, adding and causing the next artifact spell you cast this turn to have sunburst.
4. Activate Pemmin's Aura by paying , untapping Solar Array.
5. Repeat from step 3 as desired.
6. Cast any artifact spell, triggering its sunburst ability an infinite number of times, either putting infinite +1/+1 counters on charge counters on the artifact.

By leveraging Karn, Silver Golem to turn Solar Array into an artifact creature, we open the door to attaching Pemmin's Aura directly to our mana source. Tapping Solar Array for blue mana provides the exact fuel needed to activate Pemmin's Aura, untapping Solar Array to create an infinite loop of colored mana. Because Solar Array's delayed triggered ability stacks with each activation, you can then cast any artifact spell to flood it with an infinite number of sunburst triggers, resulting in infinite +1/+1 or charge counters.