At the moment Assetto Corsa and Wreckfest.

Assetto Corsa because it’s a simracing sandbox. I’ve modded it to hell with Content Manager and CSP. I also have a lot of paid mods for mainly formula cars like the RSS Formula 1/2/3/4 cars and the VRC Formula E cars. The AI is the perfect level of silly to cause absolute mayhem with the right settings, but also pretty interesting races when you want them to behave.

Wreckfest is a joy on the Steam deck and for casual mayhem. It still has a nice driving model imo, while remaining casual. The maps are optimized for crashing into others which means you’re never safe.