@Riot Ivern is good, but...
I find his W passive to be quite out of place. Sure it's fun to get those ranged auto attacks for a last hit on an escaping enemy, but it just doesn't fit with his overall theme and kit.
All of his abilities in kit, with the exception of W make it so he can gap close very well. This encourages him to be built tank.
I find that W could be better as just a passive ability all together. My suggestion would be that W should make ivern randomly spawn bushes (max 4)around his location every X amount of seconds (much like zyra plants) that last X amount of seconds. Each rank of W would increase the duration and size of the bushes he spawns.
With the reworked W he would also have a different passive on his W instead of ranged autos while in bushes. When Ivern is in a bush he gains increased armor/ magic resist/ and health regen which would also scale with rank of W.
To make the ability fair, his resistances overall could briefly drop after exiting a bush. Another idea would be to make the bushes ivern spawn degrade a a certain pace when he is fighting enemies in them.
These are just my thoughts. Suggestions?