Crystalline Crawler + Saving Grace + Vigor + Ashen Firebeast

Crystalline Crawler

Saving Grace

Vigor

Ashen Firebeast

How it works

1. Cast Saving Grace by paying 1.
2. Saving Grace enters the battlefield attached to Crystalline Crawler, triggering itself, causing all damage that would be dealt to you or permanents you control this turn to be dealt to Crystalline Crawler instead.
3. Activate Ashen Firebeast by paying 1, dealing 1 damage to each creature without flying.
4. Saving Grace's ability redirects damage to Crystalline Crawler, which results in at least three +1/+1 counters being placed on it instead due to Vigor.
5. Activate Crystalline Crawler's first activated ability at least twice by removing at least two +1/+1 counters from it, adding at least 1.
6. Repeat from step 3.