Vigor + Hanabi Blast + Crystalline Crawler + Oskar, Rubbish Reclaimer + Obosh, the Preypiercer

Vigor

Hanabi Blast

Crystalline Crawler

Oskar, Rubbish Reclaimer

Obosh, the Preypiercer

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. Oskar triggers if the discarded card was a nonland card.
4. Holding priority, activate Crystalline Crawler;s first ability three times by removing three +1/+1 counters from it, adding 1.
5. Resolve the Oskar trigger, choosing to cast Hanabi Blast if it was the discarded card by paying 1 targeting Crystalline Crawler, or choosing not to cast the card otherwise.
6. If you did not cast Hanabi Blast using Oskar, cast it from your hand by paying 1, targeting Crystalline Crawler.
7. Repeat from step 2.
8. Once you have infinite colored mana, you may instead target any other creature and/or player with Hanabi Blast.

This volatile loop turns the self-inflicted damage of Hanabi Blast into a fountain of growth and mana, anchored by Vigor’s uncanny ability to transform that burn into an avalanche of +1/+1 counters instead. As those counters pile onto Crystalline Crawler, you can simply peel them right back off to feed the mana needed to keep casting your spells. Meanwhile, Oskar, Rubbish Reclaimer lets you capitalize on the random discards required by Hanabi Blast by turning your graveyard into a staging ground, while Obosh, the Preypiercer silently doubles the devastation once you decide to point your fiery payload at your opponents.