Dragons
"Dragon: 100% Magic Immunity ⇒ 83% Magic Immunity"
I don’t really agree with Riot that the magic immunity gives few options to fight them. Generally, having one physical damage dealer like a Ranger/Gunslinger, or even an auto-attack heavy mage like a Kennen or TF can take down Dragons with ease. This is probably an indirect buff to Sorcerers and Elementalists.
"Shyvana Armor: 20 ⇒ 30"
Shyvana is certainly one of the weaker champions in Teamfight Tactics, so giving her a little survivability is nice. Won’t make her OP, but will make her better.
"Aurelion Sol HP: 600 ⇒ 650 Aurelion Sol Ability Damage: 250/450/650 ⇒ 250/500/750"
I agree with these buffs since Aurelion Sol feels very underwhelming for the tier that he is in. Probably he’ll become a bit more appealing but only if the game tilts heavily towards magic dealers.
Elementalist
"Lissandra Ability Damage: 150/200/250 ⇒ 150/275/400 Brand Ability Damage: 175/325/475 ⇒ 200/375/550"
I grouped these two together because both Brand and Lissandra have the same basic issue in Teamfight Tactics: their ults are useless. Giving both of them more damage, especially later in the game, is necessary in my opinion. With how strong Kennen still is, Elementalists might be a more viable comp.
Guardian
"Guardians: (2) 40 armor per stack ⇒ (2) 50 armor per stack. Guardian’s don’t buff themselves. Braum Armor: 25 ⇒ 75 Leona Armor: 55 ⇒ 100"
Bigger buff to allies and the units themselves get more armor since they won’t benefit from the stacking like their fellow units do. I think this is a buff overall, but they’re really only going to be used in situations where their other synergies will help buff up an ally.