AvalancheZer0
Sen Triplets are an old favorite of mine, but odds are that making a deck around them might wind up being kinda expensive. My brother had a Sen Triplets deck & it would run the typical copy artifact/enchantment/creature cards along with a lot of lockdown stuff like Ethersworn Canonist. His deck was really about slowing opponents down and then forcing them to use their own win conditions against them. Stuff like Paradox Haze, Mindslaver, and Worst Fears with a few good tutor cards basically guaranteed that he was always playing puppeteer on whoever was the biggest threat to him. & if all else failed, he had a Memnarch in the deck.
I've personally tried to build a Sedris deck, but I didn't have much luck with it. He's a very interested creature, but the problem I have with him is that he exiles your own creatures, so if your unearth attack somehow fails, you're kinda screwed because you're not getting some of your best s**t back. It'd be interesting to see what you could do with him though.
As for a prison control deck, what commander where you looking at for it? Grand Arbiter is incredibly powerful if you run all sorts of cost increase effects like Thalia and Chancellor of the Annex. At the same time Lavinia is really fun if you're running a crapton of blink effects. Plus Lavinia with Ixidron and something like Conjuror's Closet is hilarious because your opponents won't be able to undetain their now useless 2/2 creatures.
i was feeling the grixis deck because i found a lsit i was going to half follow and after some math the deck was in theory supposed to feel slightly like playing reanimator legacy, albiet alightly slower and lacking grizzlebrand, even if my friends don't care about the ban list in commander.
im not worried about cost so a good sen triplets deck would be nice as well, im willing to spend a thousand over the next few months too make it and ill probably end up getting two within the next year. i liked how i could play opponents win conditions in the sen triplets deck, it looked like it would be quite fun to jack an avacyn from someone or another battlecruiser to really mess up there game.
and i was thinking grand arbiter would be my commander since it would lower my casting costs to and speed me up ever so slightly ahead of my opponents