Stalwart Successor + Woe Strider + Heartmender

Stalwart Successor

Woe Strider

Heartmender

How it works

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