A spell cast using jump-start will always be exiled afterward, whether it resolves, it's countered, or it leaves the stack in some other way
That doesnt mean you can use one as the king and just add the others as a regular part of the deck, and because of that
Jumpstart -designed rares, uncommons, and commons can be found in non-foil and traditional foil in Set Boosters, with only non-foil extended-art rares found in Collector Boosters
This card is legal in almost every format at the moment, so get out there and raise some tides
A couple stand out even from these, which have appropriate spots later
Anything you can play for free is good in any TCG, and in Lorcana exerting a creature to play one is almost always a good deal when you get the chance