A Preordain you can just fire off regardless and it will be fine, if you need to hit land then great, cast your Sreum Visions, all good
Wizards clearly stated back in 2016 that it has no desire to police proxies, even for in-store play, as long as the events aren't sanctioned and the events are using traditional proxies and not counterfeit cards
Nearly every Jace has been under-received relative to their actual playtime thus far, and I wouldnt be surprised if that is happening again
If I'm forced to discard, do I lose cards from my program
I have definitely in the past cracked a Fetch at my opponents end step out of instinct, only to then draw a Fatal Push and not be able to kill my opponents creature as I wasted my Fetchland
Basically, Esper has so many better options than this