Single use shop powers, upgraded by Blossom. Plus the returning Carousel, the hidden Eclipse trait and the portal that opens every game.

Every shop holds four champions and, in the slot a fifth would take, a Wisp. Buy it and its power is yours for the round; skip it and the next shop deals another.
Akali1
Alistar2
Azir3
Ahri4
BarrierEvery Wisp has a base form; most have stronger tiers above it.
Blossom champions empower your Wisps after combat, and each Blossom breakpoint changes what your Wisps can do.
BaseWithout BlossomAllies gain 1250 Shield, decaying over 6 seconds.
UpgradedBlossom 3 and upAllies gain 1250 Shield, decaying over 9 seconds.
PrismaticBlossom 11Allies gain 7500 Shield, decaying over 30 seconds.The real decision is whether to build around them. If you are already fielding Blossom units, leaning into Wisps compounds fast; if not, a single well timed buy can still be the tempo play that carries a rough round. From stage 5 onward every other Wisp offered is a combat power, so the game steers everyone toward fight winning purchases once the stakes rise.
Every Wisp is tagged with the rounds it can be offered in and one of seven categories. Stage 2 pools lean on gambles and free champions; Combat Wisps take over from stage 4, and after stage 5 every other offer is one.
Because it has no breakpoints of its own, Eclipse rewards mixing two Origins that do not naturally share a comp: Solar builds shields and magic damage, Lunar builds Attack Speed and Ability Power. Splashing a couple of units from the one you are not already playing can be worth a free repeating execute in close fights.
Set 17 replaced it with Realm of the Gods; Set 18 restores the pick a champion with an item round between combat stages.
It is not a straight revert: a Carousel can now hold more champions than usual, or champions with higher costs. Several augments still key off Carousel rounds, so what you grab matters beyond the item you walk away with.
One of 20 portals rolls at the start of each game. None of them touch Wisps directly, but the gold and reroll ones change how much you can afford to spend on them.
Chances per game. They add up to 88%, so the rest is rounding or portals that are not listed.
The numbers under every round, each a click away in the side panel.