Ultimately, its the ability to grab material from nearabouts anywhere, at any time, that pushes Kewl Tune into relevance
The only eye-watering issue is Roaring Moon, a card so dominant in the meta that even its most basic incarnation, the standard ex double rare version, is fetching $13
Limited Cards Limited Skill Drain X TRAP Continuous Activate this card by paying 1000 LP
Tindangle Delaunay X TRAP When you take battle damage from an opponent's attacking monster, while you have 3 or more "Tindangle" monsters with different names in your GY: You can destroy the attacking monster, and if you do, Special Summon 1 "Tindangle Acute Cerberus" from your Extra Deck
What they do is evolve to something with O counter and an HP value between 990 and 680, because this HP value makes the AI go for the KO more often, even if their attack is about to get countered