I know that Doomsday is the perfect home for Thassa's Oracle. I have been looking at the combination of Thassa's Oracle and Paradigm Shift and I look this combo. I think Vintage is actually in a place where a deck that focuses on this combo is playable.
My issue is that I don't want to play it on MTGO, mostly because Hullbreacher is stupid expensive. I am working on a paper list and I wanted to see if there were any thoughts on making this deck work in Vintage.
The merfolk decks in Legacy are using this combo and those decks are doing ok-ish, but I think the power level is good enough for Vintage in an Esper shell. I'll post a list once I get something working.