Omni-Man (Mortal Kombat) vs Rarity: who would win?

Omni-Man (Mortal Kombat) favored — Slight edge (~55%)

Omni-Man (Mortal Kombat) · Mortal Kombat · Base

Tier

2-A

Attack Potency

Multiverse Level+

Speed

Massively Hypersonic+

Durability

Multiverse Level+

Rarity · My Little Pony · Possessed by a Spell Book

Tier

2-A, up to LOW 1-C

Attack Potency

Multiverse Level+, up to Low Complex Multiverse Level

Speed

Subsonic

Durability

Multiverse Level+, up to Low Complex Multiverse Level

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