Space Ishtar vs The Luminary: who would win?

The Luminary favored — Favored (~65%)

Space Ishtar · Nasuverse · Prime Ishtar

Tier

LOW 2-C, up to 1-C

Attack Potency

Universe Level+, up to Complex Multiverse Level

Speed

Omnipresent

Durability

Universe Level+, up to Complex Multiverse Level

The Luminary · Dragon Quest · Act 3 and Post-Game

Tier

2-C

Attack Potency

Low Multiverse Level

Speed

Massively Hypersonic, up to Massively Ftl+

Durability

Low Multiverse Level

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