I really, really want another "scry trigger" card for in Theros block. A blue one would make for nice combos with Battlewise Hoplite, too.

I agree! I was so gutted to hear that Stormcaller of Keranos used to be a "Whenever you scry" card like Flamespeaker Adept, but then they removed that trigger for the sake of the off-colour cycle. I mean, I certainly want off-colour cycles to be complete, but trigger effects like that are each a unique opportunity for a Johnny, particularly ones using non-evergreen keywords like that.