Well, you don't need to be assistant lead to make changes. Riot has already stated that everyone in each department has equal say in changes. Even interns have full power over which champions get nerfed/buffed and how. That aside, lemme get to it:
My winner for buffs will be Thresh! 
Damnation: Souls appear for for Thresh to collect. Each soul grants him +0.75 AP, armor and magic resistance(New!) Souls will linger to be collected for 8 20 seconds.
Death Sentence: Thresh hooks a targeted enemy(New!), this cannot be blocked by minions and prioritizes champions(New!). Range: 1100 1350
Dark Passage: Thresh throws his lantern shielding 1 2 allies and himself. Shielded allies gain 6/7/8/9/10 armor and magic resistance(New!)
Flay: Thresh knocks back enemies in a selected direction(knockback distance now doubled).
The Box: Thresh summons 5 walls. If one enemy hits a 2nd wall after hitting a first, they will be stunned for 3 seconds(New!)