One of my favorite decks in the whole format (though that's my bias to Rock talking) Megarock is all about dumping out your deck to run head on at the opponent and hopefully do huge damage. This is done by stacking the deck full of rock monsters, having them be milled by the Jars/Merchant before then making a Megarock (s) and using the ever broken Dimensional Fusion to take full presence and run things over.
The monster lineup is pretty much ALL of the rock monsters....the good ones, at least. Golem Sentry is a low-key MVP that enables solid stall play while being a effective counter to opposing flip monsters or big beaters, being able to waste Noblemen slots on it while not being too much of a loss to your gameplan overall. Alongside Stone Statue's huge wall-like DEF stats and double damage, this typically gets you that early advantage to work off while setting up your stuff.
Gigantes and Rock Spirit are also used given we can still use our rock resources to make similarly big monsters to establish aggro presence, not to mention they just get added to the pile as well as a 1/1. Granmarg is objectively the worst Monarch but can be still very useful as our alt-removal tech and primary target for Fusion to bring back given his big stats. Everything else is interchangable: some deck versions use more copies of Maharaghi or Elephant but I just couldn't see much of a use for them that aids the deck much for the big plays.
Spells are the usual lot minus Duo as we need the life points + there's not really a need for it in the deck, especially when most Chaos decks benefit from having stuff in the graveyard anyway. Card Destruction/Trunade allow huge presence regardless that controls the field more reliably. Rivalry especially is quite useful, especially when dealing with stuff like Panda Burn/more varied deck lots.
Side deck works some typical popular format counters alongside working more of a PACMAN strat with Medusa Worm and co. Big Shield is a good 1 of tech that can fake out a nobleman play and get in extra damage. Sphinx is amazing regardless of the deck, and Lost Guardian is a weird nerfed Gran Maju that could maybe snatch a win or two from a opponent playing sloppy and charging into it.
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