This is just a concept for a deck. It's not for competitive dueling.
I'm exploring the limits to the Return from Out-of-Play theme. Today's build has only four spell/traps, so that Magical Merchant can easily fill the graveyard with a monster toolbox for Bazoo and Skull Lair to promote to out-of-play. The Momongas, Tomatoes, and Spies fill the graveyard and minimize attack damage until the swarm is ready.
Key win conditions in this build are a Dimension Fusion swarm and a Return from the Different Dimension swarm. I'm using Mobius and Treeborn Frog as rough substitutes for Giant Trunade and Heavy Storm, which would otherwise interrupt Magician of Faith's massive monster dump to the graveyard.
I'll be tuning it as I test. Any suggestions are welcome. I'm debating putting in a Mausoleum and a United We Stand at the moment, but both of these would interfere with filling the graveyard via Magical Merchant and make Skull Lair harder to dig for.