I would not require a crazy over payment. At least I don't think so as my take on the Rangers board is not well received
My point of view, any team that trades for Kreider is getting these playoffs, next season, and next playoffs before his contract runs out.
In my possibly skewed logical take that is basically two rentals worth of stuff and a bit more for the regular season for a top line wing who has size and speed.
If some team can offer
-what will likely be two late 1sts (even if in two different drafts, even if not their own picks)
-plus two prospects, the type that usually move at deadline, limited ceiling yet projected to be at least middle 6F or ~#4D types
-some other conditional stuff in there depending on how well their team does with Kreider over those two playoffs, or if they extend him, (like some 2020 or 2021 3rd/4th round pick(s) that turn to 2nds if that team advances in the playoffs to some point or if they extend him)
That would be my framework for any deal, plus I'd be willing to take back short term cap hit(s) of some type within reason.
If the Rangers can only get a singular rental like return for him this deadline, they may as well keep him and turn him into that return next deadline should he not be extended, so it's going to have to be more than that, yet I do not expect them to get back top ceiling prospects (as those are not moving pretty much no matter what sort of Erat/Forsberg), or any super early picks (as he does not have the term left to return that.) Yet if some teams wants to offer a top ceiling prospect or a odds on lottery pick in lieu of some/most of that be my guest.
With that said I still do not love the return, all of that could turn into busts yet that is the dangerous game played when trading known for futures. Which is just part of rebuilding, taking chances that either your drafting prowess, maybe by trading up or down, or just plain luck eventually provides back at least what you are trading away if not more while it fits into a more advantageous timeline.