Melira, Sylvok Outcast + Bloodflow Connoisseur + Grazing Kelpie

Melira, Sylvok Outcast

Bloodflow Connoisseur

Grazing Kelpie

How it works

1. Activate Bloodflow Connoisseur by sacrificing Grazing Kelpie.
2. When Grazing Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Melira.
3. Resolve the Bloodflow Connoisseur ability
4. Repeat.

This infinite loop relies on Melira, Sylvok Outcast's static ability, which prevents -1/-1 counters from being placed on your creatures entirely. Because of this protection, when you sacrifice Grazing Kelpie to feed Bloodflow Connoisseur, its persist ability triggers and returns it to the battlefield completely clean of counters. This allows you to endlessly repeat the sacrifice, generating infinite creature deaths, enters-the-battlefield triggers, and stacking arbitrarily large +1/+1 counters onto Bloodflow Connoisseur.