Karsus vs Nomad: who would win?

Nomad favored — Slight edge (~55%)

Karsus · Dungeons & Dragons · Archwizard of Netheril

Tier

HIGH 6-A, up to 2-A

Attack Potency

Multi-Continent Level, up to Multiverse Level+

Speed

Relativistic+, up to Infinite

Durability

Multi-Continent Level, up to Multiverse Level+

Nomad · Star Trek · Base

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Massively Ftl

Durability

Multi-Continent Level

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