Lesser Masticore + Bloodflow Connoisseur + Hardened Academic

Lesser Masticore

Bloodflow Connoisseur

Hardened Academic

How it works

1. Activate Bloodflow Connoisseur by sacrificing Lesser Masticore.
2. When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Hardened Academic triggers, putting a +1/+1 counter on Lesser Masticore.
4. Resolve the Bloodflow Connoisseur ability.
5. Repeat.