Molderhulk + Cloudstone Curio + Dual Nature + Land's Edge

Molderhulk

Cloudstone Curio

Dual Nature

Land's Edge

How it works

1. Activate a Swamp and Forest by tapping them, adding .
2. Cast Molderhulk by paying .
3. When Molderhulk enters the battlefield, it, Dual Nature's first ability and Cloudstone Curio trigger.
4. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
5. Resolve the Dual Nature trigger, creating a token copy of Molderhulk.
6. When the Molderhulk token enters the battlefield, it and Cloudstone Curio trigger.
7. Resolve the Cloudstone Curio trigger, returning the nontoken Molderhulk from the battlefield to your hand.
8. When the nontoken Molderhulk leaves the battlefield, Dual Nature's second ability triggers, exiling the token Molderhulk.
9. Resolve the token Molderhulk's trigger from step 6, returning a Swamp from your graveyard to the battlefield.
10. When the Swamp enters the battlefield, Cloudstone Curio triggers, returning another Swamp from the battlefield to your hand.
11. Resolve the nontoken Molderhulk's trigger from step 4, returning a Forest from your graveyard to the battlefield.
12. When the Forest enters the battlefield, Cloudstone Curio triggers, returning another Forest from the battlefield to your hand.
13. Activate Land's Edge twice by discarding the Swamp and Forest, dealing 4 damage to any player or planeswalker.
14. Repeat.

This brilliant loop turns the undergrowth discount of Molderhulk into a self-sustaining engine by leveraging Dual Nature to continually generate and clear token copies. Cloudstone Curio acts as the logistical glue, bouncing your lands and looping the nontoken Molderhulk back to your hand whenever a matching permanent enters the battlefield. Once your graveyard is rich enough to cast Molderhulk for cheap, your returning lands continuously fuel Land's Edge to discard them for an endless stream of damage.