Kamen Rider Gatack vs Nagash: who would win?

Nagash favored — Slight edge (~55%)

Kamen Rider Gatack · Kamen Rider · Post-Oma Day

Tier

1-A

Attack Potency

Outerverse Level

Speed

Immeasurable

Durability

Wall Level, up to Outerverse Level

Nagash · Warhammer Fantasy · The God of Death

Tier

1-A

Attack Potency

Outerverse Level

Speed

Omnipresent

Durability

Wall Level, up to Outerverse Level

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