Not only does this CE provide a nice art, it also offer a good Buster card performance boost as well as a NP damage buff as well. Very useful on servants with like Francis drake who deals a ton of damage with her Buster card NP.
Increase your Buster Card effectiveness by 10% & NP Strength by 20%
Increase your Buster Card effectiveness by 15% & NP Strength by 25%
Beside using it for it’s event effects, it is still a very good CE due to its effects. Other than the obvious servants like Heracles that have 4 Buster cards (NP included), servants like Emiya and Arjuna are great as well because their decks enable them to spam their NP which are Buster cards as well.