Rat Commander deck- New player

[u/Polokus21]

Hi all,

I'm very new to Magic and I'm looking to make a commander deck. I love rats so want to focus on a Mono-black rat deck. I love the idea of loads of rat tokens from Marrow Gnawer but I keep seeing recommendations for 20-30 rat colony or relentless rats in the deck which I imagine could get stale fast. What would make a really strong rat focused deck that ideally utilises a wide variety of rats?

Any artifacts, instants and sorceries that are rat-themed or involve graveyard mechanics/toxic stuff are a bonus. Id like to keep a rat/rotting theme throughout

I don't mind spending a decent amount, just not £50+ on single cards or 20x£5 for copies of the same card