The containment preist interaction is so cool! My favorite is the princess takes flight saga , etb exile creature , blink with phelia , repeat. Im sure there are tons of other good sagas in this deck!
Generally when I manage to get Priest in play, I do pivot to targeting opponent cards for my blinking stuff. It does get targeted pretty quickly at that point.
He was in the deck in the early stages, but as I shifted the focus to exile more of my opponents' cards than my own, Preston started to not be as impactful.
