Bringing back Diversity in Summoners'

Probably more than half of these are really dumb. Whelp whatever. {{summoner:2}} Clairvoyance Maybe increasing field of vision by 3% (Upgrades at level 9 & 13 by 2%)?

Clarity As mostly everyone is saying, as passive mana regen, .75% of missing mana every 2 seconds? (Mini Athene's unholy Grail because I haven't seen anyone building that in ages,so this would help mages)

Cleanse Passive tenacity? (3% + .25% every level,max at 7.5%) because the skill is based around removing cc.

Exhaust Passive damage nerf? Skills debuff enemy damage by 2%,and basic attacks debuff enemy damage by 4% (For ~1.5 seconds?) Doesn't stack with exhaust active. Would help tanky supports like leona help allies more than just ccing.

Ghost 10% chance of no unit collision for 3 seconds after running into a minion/monster/champion?

Heal Passive lifesteal and spellvamp as a 'recovery' other than hitting heal. (5% lifesteal and spellvamp?)

Ignite Basic attacks apply Grievous wounds for .75 seconds.

Smite Deal .5% extra true damage on large monsters. This could help with clears on non-conventional junglers.

Teleport I got nothing.

Post in comments for ideas or something?