Shyvana will be absolutely unfair with her new passive
it is an extreme amount of extraneous power tied to an objective. This kind of idea has already proven to be either too strong or absolutely awful with no in-between
; why are you taking it a step further and giving her bonuses based on which dragon spawns?
With 3 mountain drakes Shyvana can solo Baron and Elder drake with almost no damage taken, as well as being able to tear down turrets without minion waves. The 20% reduction from monsters via passive combined with the 30% bonus true damage to monsters makes her one of the strongest splitpushers. She will have some of the fastest objective-killing in the game, to boot.
3 Infernals will have the same effect on her damage in teamfights; with 10% of her damage becoming true, she will shred through any champion even harder than she already does.
Ocean giving her CDR will mess with builds and rune pages; especially an uneven number like 15. Something similar was tried with Cassiopeia's first rework and it proved to make her builds less flexible and more frustrating. It's not necessary.
Air Drake is the least offensive, but slow resistance is a powerful stat right now.
tl;dr I'm surprised this passive is even being considered. Riot even knows that making her reliant on this would make her too feast or famine. But making her not NEED the buffs like she currently does just creates one of the strongest win-more mechanics in the game. At most, the bonuses should be very minor and utilitarian; these huge boons to objective-taking and damage potential are simply too much, and should NOT be her primary passive.
passive:
. My guess is that you're noting that builds that need no sustain (with Ocean Drakes) will favor those items, but really, she could still go a number of ways. Not sure how one possible build on her is going to be evidence of something, particularly when dependent on a certain Drake. And what about the other Drakes?
: Hey guys got room for one more?
: huh?