Severin is best in multiples, so why not copy him?
It would be reasonably to add a Sudden Schism to the board, But I haven't felt I've needed one. I'm not certain Azindel is pulling his weight there. Copying Varas and Caiphuses continues to be as good as it ever was.
If your Severin hits an Amber Ring, look for an opportunity to tutor for a Crystalline Chalice. That is a very powerful value engine.
If you are seeing a lot of bore, probably bring out the Equivocate or the Azindel and throw an Unseal or Dissociate into the market to deal with it.