Stalwart Successor + Shilgengar, Sire of Famine + Persistent Constrictor

Stalwart Successor

Shilgengar, Sire of Famine

Persistent Constrictor

How it works

1. Activate Shilgengar by sacrificing Persistent Constrictor
2. When Persistent Constrictor dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Persistent Constrictor enters, Stalwart Successor triggers, putting a +1/+1 counter on Persistent Constrictor
4. Resolve the Shilgengar ability.
5. Repeat.