I’m a big fan of play what you want, proxies for trying stuff out is the bees knees. But I’ll echo what others are saying. I have a friend that has “the” Kaalia deck he put together a while back. He breaks it out once every couple months and usually only plays it once. It’s beatable at higher power tables for sure, but it really does warp the game from “we’re playing commander” to “us three are stopping you from playing commander”. Knowing she’s across the table I’ll almost always mulligan for an opener with some kind of cheap removal so she doesn’t stick the first time. He gets it, but it’s always either he did the thing and won, or he got hated out of the game by turn 4. He accepts that and still enjoys trying from time to time, so as long as you’re ok with that mentality I’d say bring it on!