Why doesn't Garen have more Anti-Mage components in his kit?
His lore specifies that he HATES magic and mages, yet he has... a silence. Here's my 2 cents.
W - Reworked
Passive no longer gives Armor, but gives up to double the MR.
Active is now an AoE magic shield for his team (Like a magic locket).
R - Buff
Damage no longer scales with enemies missing health, but scales with their AP (A la old veigar).
This makes him less of the "Poor Mans Darius" and gives him more of a niche, that niche being "Juggernaut Mage Eraser".

seriously does need to be buffed, currently he is just a gimp darius/cho'gath/renekton/riven and even his fucking sister has ULT CDR built into her kit which is just sad that they overlooked him so much and gave him a measly armor shred that is hard to apply reliably in teamfights. If a character has No Welfare Flash No Hard CC and No Ranged Gimmick then their kit needing a buff is completely justified and Garen fits the bill more than anyone. His W should infinitely stack imo so that he can become a threat like veigar and nasus. If infinitely stacking AD/AP is fair then there is nothing wrong with the opposite. Garen needs his silence duration Q MS and BASE MS back to pre nerf state because his kit was LITERALLY built around speed. He might be a juggernaut but there are tons of characters that break the mold of what their niche class denotes and why not let Garen have speed be the thing that sets him apart from all the others in that niche. He trains harder than most other champions so I don't see why the MS nerfed his brain into forgetting leg day. I refuse to spend a penny on this game with Garen in his current state but if he was buffed back into competence at high level play then I would BUY every single Garen skin to show my support.
[zombie-brand-facepalm] Apparently the Devs don't want my money.