Some buffs to make Ivern's kit at least functional

1: Daisy should not die when Ivern does. Tibbers doesn't die when Annie does, so Daisy shouldn't die when Ivern does. It feel very arbitrary that she is immediately dispelled, when, as far as I know, no other fire and forget/deployable ultimate does the same.

2: Enemies should not be able to see through Brushmaker. They cannot see through normal brush, but are apparently able to see through Brushmaker's. This reduces the ability's potential, as it takes away a core aspect of what makes brush useful in a fight.

3: Ivern and his allies should have vision inside his brush at all times. It makes absolutely no sense that enemies can benefit from his abilities like this.

Those are the most basic ones, but there's one more that's bigger and more complicated.

4: His attack range. Ivern seems built from the ground up to be ranged, but his range was shifted entirely onto a passive benefit on his W. This makes him quite unwieldy, because he's not fit for close combat due to low survivability and a lack of reliable and versatile mobility, coupled with low attack damage. (It is also possible that the damage bonus from his W is pre-compensated, leading to him having sub-par DPS without Brushmaker's effect and par damage with it)

I'd suggest letting him keep his current Brushmaker range (450, still noticeably low, as ordinary ADCs tend to range upward from 500. Even Kindred has 500, and she gets bonus range from her passive) at all times, and give him a new passive where his range increases while in brush, and for 3 seconds upon exiting brush. Say, an increase of 75 would be nice.

Brushmaker can then upgrade that passive (Much like one of Ilaoi's abilities upgrades her passive) to give it an additional 25 bonus range per level. This would cap him out at 650 range, close to what Tristana can accomplish at max, and making him compete with Caitlyn. I think this would greatly help him sit better in teamfights, where his incredibly short attack range and the fact that one of his abilities only affects his basic attack damage clashes greatly with his lack of mobility, survivability, and the relatively long range on his Q and E.

I like Ivern's character, but I'm pretty sure the guy is not viable and needs help.