Sivir vs Samuel Liddell MacGregor Mathers: who would win?

Sivir favored — Slight edge (~55%)

Sivir · League of Legends · Base

Tier: 6-B
Attack Potency: Country Level
Speed: Subsonic
Durability: Unknown

Samuel Liddell MacGregor Mathers · Toaru Majutsu no Index · Real Mathers

Tier: 6-B
Attack Potency: Country Level
Speed: Average Human
Durability: Human Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.