Lord Tirek vs Izis: who would win?

Izis favored — Slight edge (~55%)

Lord Tirek · My Little Pony · Third Form

Tier

2-A, up to LOW 1-C

Attack Potency

Multiverse Level+, up to Low Complex Multiverse Level

Speed

Subsonic, up to Infinite

Durability

Multiverse Level+, up to Low Complex Multiverse Level

Izis · Tensei Shitara Slime Datta Ken · Base

Tier

2-A

Attack Potency

Multiverse Level+

Speed

Massively Hypersonic+

Durability

Multiverse Level+

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