This might be a terrible idea, but @Riot, have you considered making items with negative effects?

By that I mean strictly negative effects, such as -20 Movement Speed, or -10% Health, and that would act as an additional "payment" for certain effects, something with a trade off like that. So nothing that could potentially be bad, such as granting increased size, and therefore being a larger target to get hit by spells, or remaining gold inefficient until you get at least 6 stacks on it.

Have any negative effects on items ever been considered as ways to balance powerful effects on items?

Personally, I think it'd be an interesting way to spice up some of the items. Give them some more power, but at a cost that goes beyond mere gold. Or, rather than add those kinds of effects to existing items, why not make a new tier of items above Mythic?

• Maybe a Tier 2 (3?) Boot upgrade that gives you no bonus movement speed (or maybe even less than your base?), but what you get in return is stacking slow on your basic attack and/or abilities.

• What about an item that gives your abilities an additional X% magic damage on hit but at the cost of Y% of your current health? (A cool UNIQUE PASSIVE name I came up for this would be Blood Magic)

• How about an item that's stupid overloaded, like some kind of on crack, but it takes up an additional item slot?

Idk, it could be fun and I think it'd definitely be interesting, but it could also potentially break the game if not balanced correctly. Speaking of balance, they'd probably be a nightmare to get just right.