Vigor + Hanabi Blast + Crystalline Crawler + Bösium Strip + Obosh, the Preypiercer

Vigor

Hanabi Blast

Crystalline Crawler

Bösium Strip

Obosh, the Preypiercer

How it works

1. Activate Bösium Strip by paying 3 and tapping it, allowing you to cast instants and sorceries from the top of your graveyard this turn.
2. Cast Hanabi Blast either from your hand or from the top of your graveyard by paying 1, targeting Crystalline Crawler.
3. 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.
4. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding 1.
5. Repeat from step 2.
6. Once you have infinite colored mana, you may instead target any other creature and/or player with Hanabi Blast.

This eccentric loop turns Hanabi Blast into a self-sustaining engine by taking advantage of Vigor, which intercepts the spell's damage to Crystalline Crawler and converts it into a surplus of +1/+1 counters. You can then strip those counters right back off Crystalline Crawler for mana, fueling the re-casting of Hanabi Blast while cycling cards away to its random discard clause. Meanwhile, Bösium Strip can kickstart the loop from the graveyard if needed, and Obosh, the Preypiercer sits proudly on the sidelines (or commands the battlefield) to double the devastation once your infinite mana is established.