@RiotRepertoir Nunu/Riven+Guinsoo
About Guinsoo. Can you make Riven's Ult and Nunu's W bonus ad dynamic? Currently they're the only ones who get the bonus ad / ap on cast. The usual formula for other champs is: ad1 = (ad + ad2) * % //Ability ad2 = (ad + ad1) * % //Guinsoo
On riven and nunu, because they gain the bonus on cast they get this, i'll show the riven example: ad1 = (ad + 0.24 * ad) *0.2 ad2 = (ad + ad1) *0.24 This happens because ad1 being non dynamic cannot increase the bonus ad that guinsoo gets from ad1, since at cast ad1 is 0. This is even worse if Riven/Nunu activate their abilities before charging Guinsoo.
I'm not saying this to buff these champs since i don't even use them, but since you said you wanted to increase the pool of champions using Guinsoo this might help for Riven and Nunu. For Riven this might even help a bit for losing Darkthar's damage.
That's one. Two. I tested other stackings, just look at them and see if they act as they should: Guinsoo stacks additively with Rabadon's and Dragon Vladimir's Passive bonus hp stacks additively with Cinderhulk and Overgrowth, by comparison his bonus ap stacks multiplicatively with Guinsoo. PS: For those who don't know, the formulas above, for champs' abilities + Guinsoo, mean that they stack multiplicatively.