Nim Deathmantle + Ashnod's Altar + Dryad Arbor + Omnath, Locus of Rage

Nim Deathmantle

Ashnod's Altar

Dryad Arbor

Omnath, Locus of Rage

How it works

1. Activate Ashnod's Altar by sacrificing Dryad Arbor, adding CC.
2. When Dryad Arbor dies, Nim Deathmantle triggers, causing you to pay 4 to return Dryad Arbor from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
3. When Dryad Arbor enters the battlefield, Omnath's first ability triggers, creating a 5/5 Elemental creature token.
4. Activate Ashnod's Altar by sacrificing the Elemental token, adding CC.
5. When the Elemental dies, Omnath's second ability triggers, dealing 3 damage to any target.
6. Repeat.