You probably want a Jester's Cap plan for the board. Either a few more creatures could work or perhaps some Pithing Needles.
With Oaths, Intuitions and Rainbow Lands, Ancient Grudge and Ray of Revelation can be solid in the board.
If peoplew are moving away from stp and snuff out towards edicts and tarrif as the removal of choice, having creatures that dodges them in the sideboard would be interesting. In particular woodfall primus, since it deals with the main engines in the format. Having primus land on consecutive turns could be game-breaking against a variety of decks.
Including a single grudge main would make a lot of sense, since it is so convenient to play it in response to a blessing trigger against an artifact obstacle (ensnaring bridge or either half of a grindstone or time vault combo threatening the win in next turn). It would be stronger with only one blessing in the deck.