The game you're referring to is likely "Super Mario 3D World + Bowser's Fury," an enhanced version of Super Mario 3D World, exclusive to the Nintendo Switch. This version includes the original game plus new content, Bowser's Fury.
Check local marketplaces (Facebook Marketplace, Craigslist, eBay). Used cartridges often sell for $35–45. Unlike a ROM, a used cartridge is 100% legal and works perfectly. The game you're referring to is likely "Super
Even if you find a working ROM, emulating a Switch NS exclusive like Bowser’s Fury is unstable. The game uses unique shaders and physics tied to the Switch’s Tegra X1 chip. You will experience: The game you're referring to is likely "Super