Vigor + Hanabi Blast + Crystalline Crawler + Conspiracy Theorist + Branching Evolution

Vigor

Hanabi Blast

Crystalline Crawler

Conspiracy Theorist

Branching Evolution

How it works

1. Cast Hanabi Blast by paying 1, targeting Crystalline Crawler.
2. Resolve Hanabi Blast, putting four +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 intricate engine uses Hanabi Blast as a repeating source of damage directed at your own Crystalline Crawler, whose counters are supercharged by Branching Evolution and Vigor's damage-replacement effect to massively grow the creature whenever it takes a hit. Crystalline Crawler then sacrifices those freshly minted counters for mana to recast the spell. Meanwhile, Conspiracy Theorist plays a crucial role by catching the random card discarded by Hanabi Blast, allowing you to exile and cast it if needed to keep the loop fueled while you spin up infinite damage, mana, and storm count.