Kodama of the Center Tree + Deathrender + Yahenni, Undying Partisan

Kodama of the Center Tree

Deathrender

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Kodama.
2. When Kodama dies, its soulshift ability and Deathrender trigger.
3. Resolve the Kodama trigger, returning it from your graveyard to your hand.
4. Resolve the Deathrender trigger, putting Kodama from your hand onto the battlefield and attaching Deathrender to it.
5. Resolve the Yahenni ability.
6. Repeat.