Beast (Undead Unluck) vs Ice King (Adventure Time): who would win?

Too close to call

Beast (Undead Unluck) · Undead Unluck · Base

Tier
HIGH 7-A
Attack Potency
Large Mountain Level
Speed
Massively Hypersonic+, up to Ftl+
Durability
Large Mountain Level

Ice King (Adventure Time) · Adventure Time · Season 3

Tier
HIGH 7-A
Attack Potency
Large Mountain Level
Speed
Massively Hypersonic+
Durability
Large Mountain Level

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