Cheapest priced copy (Coldsnap): $0.79 at Card Kingdom, near mint, their price list as of .
Jokulmorder 
Creature — Leviathan · 12/12 · Rare · Coldsnap · #37
Trample
This creature enters tapped.
When this creature enters, sacrifice it unless you sacrifice five lands.
This creature doesn't untap during your untap step.
Whenever you play an Island, you may untap this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper