Stalwart Successor + Furystoke Giant + Phantom Train

Stalwart Successor

Furystoke Giant

Phantom Train

How it works

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