Cumulative delta, not just the latest patch

Ambessa

Minor net nerf (score -1, 2 buffs / 3 nerfs). Notable: Q monster damage 125→150; Q bonus damage to monsters 150→125; E damage 40→50. Touched across patches 25-5, 25-23, 25-24, 26-4, 26-9.

Briar

Minor net buff (score +1, 2 buffs / 1 nerfs). Notable: R range 10000→12000; E cast time after channel 25→15; base health growth 100→95. Touched across patches 25-13, 25-14, 25-18, 25-20, 26-9.

Ezreal

Minor net buff (score +2, 4 buffs / 2 nerfs). Notable: Q ap ratio 15→40; R damage to minions / non-epic monsters 175→150; W ap ratio 70→90. Touched across patches 25-6, 25-21, 26-9.

Gragas

Untouched (score +0, 0 buffs / 0 nerfs). Changes are qualitative; check the patch notes for details. Touched in patch 26-9.

Shyvana

Mixed changes (score +0, 4 buffs / 4 nerfs). Notable: E magic damage 80→50; W shield 60→75; W dragon form heal 75→60. Touched in patch 26-9.

Tahm Kench

Minor net buff (score +2, 3 buffs / 1 nerfs). Notable: R move speed on ally devour 40→60; E grey health to hp conversion 45→60; passive damage 6→5. Touched across patches 25-24, 26-8, 26-9.

Taliyah

Minor net buff (score +1, 6 buffs / 5 nerfs). Notable: E monster damage modifier 175→190; Q empowered damage 190→180; Q mana cost 65→55. Touched across patches 25-12, 25-18, 26-5, 26-9.

Udyr

Minor net buff (score +1, 1 buffs / 0 nerfs). Notable: Q bonus damage on-hit for 4 seconds 5→6. Touched across patches 25-11, 26-4, 26-9.