Sun Titan + Woe Strider + Shade's Form

Sun Titan

Woe Strider

Shade's Form

How it works

1. Activate Woe Strider by sacrificing Sun Titan.
2. When Sun Titan dies, Shade's Form triggers, returning Sun Titan from your graveyard to the battlefield.
3. When Sun Titan enters, it triggers, returning Shade's Form from your graveyard to the battlefield attached to Sun Titan.
4. Resolve the Woe Strider ability.
5. Repeat.