Lathliss, Dragon Queen + Cloudstone Curio + Dracogenesis

Lathliss, Dragon Queen

Cloudstone Curio

Dracogenesis

How it works

1. Cast the Dragon in your hand without paying its mana cost.
2. When the Dragon enters the battlefield, Cloudstone Curio triggers if the Dragon isn't an artifact and Lathliss triggers.
3. Resolve the Cloudstone Curio trigger, if applicable, choosing to return nothing.
4. Resolve the Lathliss trigger, creating a 5/5 Dragon creature token.
5. When the Dragon token enters the battlefield, Cloudstone Curio triggers, returning the Dragon cast in step 1 from the battlefield to your hand.
6. Repeat.