I personally play with a green and white deck
If an opponent's commander would die, that player may choose to save it and move it to the command zone before Ravenous Slime gets a taste of it, or that player may choose for Ravenous Slime to exile their commander and then save their commander from exile and move it to the command zone
To get things started, you just need a copy of Said/Done in exile with a kick counter on it and Chun-Li on the battlefield
As far as generic removal and one of the best Polymorph effects in MTG, Chaos Warp is one of reds best ways to remove permanents
With the right build, this could make Cayth an incredible go-wide Artifact Commander option, if youve been wanting such a thing
If you untap mana rocks, this could be mana neutral