Don't flame if this has already been suggested, I've read around quite a bit and haven't seen many alternatives.
I just started a few weeks ago. But to my understanding, Sundial used to let you draw 2cards, and it held creatures in statsis for 2turns. Was this the upgraded version?
Regardless, right now the upgrade for Sundial is instead of 1time, it costs 1more light. 0 to cast, 2 light to use. That is in no way worth 1500 to upgrade...it's basically a latteral move, not an upgrade, unless you are avoiding using time element.
Anyways, if indeed it was draw 2 cards, and stasis for 2turns....that is a little OP, but the upgrade NOW is meh. My suggestion is for the Sundial to upgrade to 2stasis or 2draws. Same cost. One or the other, but not both.
eh?=)