I refuse to add more types because the game allows me to create only 1 additional type, so it just isn't worth it in my eyes, since a real type expansion would mean both Dark and Metal added, not just one or the other
So we'll just focus on PSA
While Imotekh does have some combo potential such as Tortured Existence + Phyrexian Altar for infinite death triggers (add a finisher like Zulaport Cutthroat to win), it can also focus on just pooping out a ton of creature tokens and winning with those instead
If youre in an established playgroup adept at pregame chats, then not much
The Master, Mesmerist The Master, Mesmerist turns your opponents against one another in a 3- to 4-player pod
For example, a 2/2 will die to a 3/3 because 2 toughness is lower than 3 power