Phantom (Minecraft) vs Thor (Toaru): who would win?

Thor (Toaru) favored — Slight edge (~55%)

Phantom (Minecraft) · Minecraft · Base

Tier

9-A

Attack Potency

Small Building Level

Speed

Superhuman, up to Subsonic

Durability

Building Level

Thor (Toaru) · Toaru Majutsu no Index · Base

Tier

9-A, up to 6-A

Attack Potency

Small Building Level, up to Continent Level

Speed

Sub-Relativistic

Durability

Small Building Level, up to Country Level

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