Cavalier of Night + Mirror Image + Bloodflow Connoisseur

Cavalier of Night

Mirror Image

Bloodflow Connoisseur

How it works

1. Activate Bloodflow Connoisseur by sacrificing Mirror Image.
2. When Mirror Image dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
3. When Mirror Image enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
4. Resolve the Bloodflow Connoisseur ability from step 1.
5. Repeat.

This loop hinges on a clever identity swap, where Mirror Image enters the battlefield copying Cavalier of Night so it can inherit the Cavalier's death trigger. Once in play as a Cavalier, you feed it to Bloodflow Connoisseur to cash in on its sacrifice and pump up the Connoisseur with a +1/+1 counter. That death sends Mirror Image to the graveyard, which triggers the ability it borrowed from Cavalier of Night to instantly resurrect itself back to the battlefield as a fresh copy of the Cavalier.