Nazgûl enters, triggering its first activated ability and Blasting Station.
Resolve Blasting Station's ability, untapping it.
Resolve Nazgûl's ability, causing the Ring to tempt you; choose Nazgûl as your Ring-bearer, making it legendary.
Nazgûl's second activated ability triggers, putting a +1/+1 counter on each Wraith you control.
Activate Blasting Station by sacrificing Nazgûl.
Ratadrabik of Urborg triggers, creating a token copy of Nazgûl that's a 2/2 Zombie.
Resolve the ability from step 6, dealing 1 damage to any target.
Repeat from step 2.
This loop is a masterclass in turning the Ring's temptation into a relentless engine of destruction, anchored entirely by Ratadrabik of Urborg keeping our legendary copy-chain alive. When you cast a Nazgûl, it enters the battlefield and triggers both its own Ring-tempting ability and the untap clause on Blasting Station. By choosing that Nazgûl as your Ring-bearer, it instantly becomes legendary, allowing Ratadrabik of Urborg to spot its demise when you sacrifice it to Blasting Station for 1 damage. Because Ratadrabik of Urborg makes the resulting token a nonlegendary 2/2 black Zombie, it neatly sidesteps the legend rule while still triggering Blasting Station's untap to start the loop all over again.