I like the chains idea, but can Ritual Storm really afford to have sb slots dedicated to the outcome matchup?
I love Phyrexian Obliterator but since we'd be bringing it in mana denial/sphere matchups, can we reliably pay XBBBB to cast that thing when Ritual is mostly a colored mana fix?
Black knight just isn't good enough and plague spitter doesn't deal with Lavinia without therapy.
Pack rat just doesn't pan out against shops between revokers and Ballistas.
I think the only reliable plan B in the current state of things is Tinker Bot and/or Mentor if you splash white.
I like the Burning wish idea, it's much better than Petition in the face of Lavinia and/or at finding answers to disruption. It also does a better job at abusing broken cards like LED, Demonic Consultation and Gifts Ungiven. But Dark Petition has a lot more raw power and consistency.
@stasis_kismet In my experience, bringing in Hurkyl's has not been worth it because being reactive against PO tends to be a losing plan since they plenty of countermagic. I have found the PO matchup extremely difficult. Grid + discard has been the best plan I have found, but even that is typically not enough. They're just better able to disrupt your gameplan than you're able to disrupt theirs, and they're just about as fast as you are.
If you want to beat outcome, you can sideboard Sadistic Sacrament. This card will beat the pants off most outcome lists.
I always wonder why Cap effects aren't played more often, when there are so many decklists out there that have all of 1-3 win conditions.