Stalwart Successor + Viscera Seer + Glen Elendra Archmage

Stalwart Successor

Viscera Seer

Glen Elendra Archmage

How it works

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