Samwise the Stouthearted + Nim Deathmantle + Ashnod's Altar + Memnite

Samwise the Stouthearted

Nim Deathmantle

Ashnod's Altar

Memnite

How it works

1. Activate Ashnod's Altar by sacrificing Memnite, adding CC.
2. When Memnite dies, Nim Deathmantle triggers, choose not to pay for the trigger.
3. Activate Ashnod's Altar by sacrificing Samwise the Stouthearted, adding CC.
4. When Samwise the Stouthearted dies, Nim Deathmantle triggers, causing you to pay 4 to return Samwise the Stouthearted from your graveyard to the battlefield, and attach Nim Deathmantle to it.
5. When Samwise the Stouthearted enters the battlefield, it triggers, returning Memnite from your graveyard to your hand, and causing the Ring to tempt you.
6. Cast Memnite by paying 0.
7. Repeat.