While thats its primary focus, its worth noting that the ability can be used on any artifact as long as you solve the case
Commander is a format in which your whole deck is based on a legendary creature that you choose as your Commander, and it stays in your Command zone, so it's not hard to see why Karakas can never see play
On its own, its two Willpower for one ink made it a great first turn play, but then the Challenger trigger comes in and makes him fight like hes a 3/2
I will also include additional cards like the Nazgl, which is restricted to nine copies, but still bypasses the regular 4-copy restriction
I have some history with a deck like this, as my Queen Marchesa was built primarily to be a Samurai deck, using humans as the secondary theme
If Space Beleren is on the battlefield, another Space Beleren coming under a player's control won't affect any creature's sector assignment