Solar Array + Katsumasa, the Animator + Pemmin's Aura

Solar Array

Katsumasa, the Animator

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 using Katsumasa, the Animator to turn Solar Array into an artifact creature with its active animation ability, we can attach Pemmin's Aura directly to the mana-producing land. This sets up an infinite loop where Solar Array taps for mana, and Pemmin's Aura spends a portion of that generated mana to untap it right back. Because Solar Array's ability tracks the next artifact spell cast this turn and grants it sunburst, looping this process arbitrarily many times accumulates a massive deferred sunburst multiplier. When you finally cast any artifact spell, Katsumasa, the Animator's presence and the accumulated sunburst cascade together to flood that spell with infinite counters.