Solar Array + Xenic Poltergeist + Pemmin's Aura

Solar Array

Xenic Poltergeist

Pemmin's Aura

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 turning Solar Array into an artifact creature with Xenic Poltergeist, we set the stage for Pemmin's Aura to enchant it directly. Once enchanted, Solar Array can tap for mana to pay for Pemmin's Aura's untap ability, creating an infinite loop of mana and activations. This endless tapping and untapping charges up Solar Array's delayed sunburst trigger an arbitrary number of times. When you finally cast any artifact spell, that spell enters with infinite +1/+1 counters if it's a creature, or infinite charge counters otherwise.