Take any 5 non-keystone runes you want, plus an additional one. The enemy doesn't get to know what they are. Bonus stats are determined by which tree gets how many runes selected.
Why not? I'd sure like to have Cosmic Insight, Ultimate Hat AND Presence of Mind all at once, and I'd give up an actual keystone to attain it.
unbalanceable mess tbh
I would certainly love having Revitalize, Presence of Mind, Manaflow Band, Approach Velocity, and Legend: Alacrity/Tenacity on Taric. I find most of the keystones to be really underwhelming on Taric since the nerf to Aftershock's cooldown.
I just made keystones that are more controlled balance and actually far more interesting than what we have now. Go ahead and check them out, my personal favourite is Present Barrage (intended to be a more fun and interesting version of the item getting one, that also offers more champions the ability to be able to use this keystone than just ezreal and gangplank) where your ability hits against enemy champions grant one of three present types at random in a bonus item slot just for the presents (and if the present gives an item like a ward) and then you open up the present and it gives a random effect based on the present type, the rate this happens has a cooldown.
https://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/bHmzJeEN-keystone-concepts-utility
