What changes would you make?

remove heimer for lore reason make it lulu, or maybe teemo but rumble despises heim

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Unlocking more schematics slots. I know that nothing is stopping me from house-ruling more slots but I wish it was built in to the game. I know having access to too many of them would be op but there are a lot of schematics I don't think I can ever really justify choosing over their better counterparts. I could understand capping how many boost schematics you get to pick especially, but many of the hack schematics don't seem game changing enough to grab when the limit is 2 total schematics.

I think that's part of why I like Heimerdinger a lot. He has plenty of good boost options, his slot schematic is extremely versatile, and his few scrap schematics are ridiculously strong.

Tristana has some cool options, but her explosive charge is such a good schematic to get early game as it helps you protect objectives, damage enemies, and rack up team gears. I don't know if there was a single mission I didn't take it on so that left only one other schematic option. Kaboom would be a really cool addition to explosive charge's early clear/farming power but she would be left with nothing to farm for. She's got good schematics for farming and then she's got good hack schematics that require farming but she can't really have enough of either so it's just farm and boost.

Corki's Ace Pilot and Mad props are way too good to not get once you can unlock them. Like way too good. As cool as special delivery is it can't really compete with upgraded commands.

Ziggs has more niche and situational options and I feel like he probably has the best schematic diversity per mission once you unlock everything.

I think access to more schematics slots could have been balanced by having damage cards that take away team gears. You can often find yourself in situations where from gear 8 to gear 15 you don't have much to gain along the way because you chose early-mid schematics, and once you've gotten mostly slotted the damage is pretty irrelevant. If everyone takes damage in the same turn, it's likely they can undo it in the next draft.