Vigor + Hanabi Blast + Crystalline Crawler + Conspiracy Theorist + Fiery Emancipation

Vigor

Hanabi Blast

Crystalline Crawler

Conspiracy Theorist

Fiery Emancipation

How it works

1. Cast Hanabi Blast by paying 1, targeting Crystalline Crawler.
2. Resolve Hanabi Blast, putting six +1/+1 counters on Crystalline Crawler due to Vigor's first ability, and then returning Hanabi Blast to your hand and discarding a card at random.
3. Conspiracy Theorist's second ability triggers, allowing you to exile the discarded card from your graveyard if it was a nonland card and cast it from exile this turn.
4. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding 1.
5. Cast Hanabi Blast either from your hand or from exile by paying 1.
6. Repeat from step 2.
7. Once you have infinite colored mana, you may instead target any other creature and/or player with Hanabi Blast.

This fiery loop revolves around pointing your own damage inward to rapidly swell your resources. When you target Crystalline Crawler with Hanabi Blast, Fiery Emancipation triples the damage, which Vigor converts into a massive influx of six +1/+1 counters instead of harm. You can then strip away three of those newly minted counters using Crystalline Crawler's mana ability to fund the very next casting of Hanabi Blast. Meanwhile, whenever Hanabi Blast forces you to discard at random, Conspiracy Theorist steps in to let you exile that discarded card and seamlessly recast it right back into the fray.