Along the lines of what @hankzhong said, isn't this deck just better without burning wish? It makes comboing faster and more consistent, and frees up enough space in the board to have a good shops matchup while not ignoring stuff like dredge.
I mean, adding oath to combat shops is still a great tactic. In a meta defined by shops and mentor-control, a deck like storm that already has a good control matchup, if it could be tweaked to have a better shops matchup, could be a real force.
There are other options, but it turns out that most of them are good only in really specific situations where in most situations Griselbrand is quite good. I agree on the multiples thing, if I were playing control oath right now i would split 1 griselbrand w/ 1-2 Rune Scarred Demon. I am not, because in this deck, just ignoring containment priest, oathing twice and winning with a memory's journey return'd yawgmoth's will has been real good.
Post board against shops I think your best bet creature wise is a mix of blazing archon (or elesh norn) and griseldad. Blazing Archon literally turns off their chances of winning against most modern shops lists, and griselbrand helps you win the game before they get a trike with enough counters to kill either the archon or you. Elesh Norn has been good, but sometimes you need to oath against, and it doesn't win through Wurmcoil which is frustrating.
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