You can only activate "Beliskha Catharina" effect once per turn
Declan's seemingly apathy of the people who turned into cards and his decision to make Riley a Lancer made Yuya initially thought him as being heartless and only viewing them as disposable pawns, but it's later revealed that Declan actually cares for the well-beings of his friends and others, and would go great lengths to save them
Description: When your opponent activates a Spell/Trap Card or monster effect that would destroy a monster(s) on the field: Pay 1500 LP
(Rayel Beat) 2020-12-06 Starry Knight! 2020-10-11 machine angel 2020-08-24 Dual Avatar Trap Beat See all Deck Lists for "LIGHT" 2022-11-11 [Play] Business Trip Value Set 2022-09-28 lawn mowing Chaos Zone 2022-09-19 The World Line Where Carriers Live (MD) 2022-08-28 [7th season] Hikari Dual 2022-07-18 Prediction Princess 2022-04-01 [NR Fes] Tokimei Hippo 2022-02-04 mass duet export 2021-08-06 Small World I want to use it 2021-03-16 Thunder Dragon 2021-02-14 Carrying on a piggyback 2020-12-07 My strongest Starry Knight 2020-12-06 Holy Trap It
as they're worded now, you can trigger them as much as you want.
High-grade copies are nearly impossible to find, and even this PSA 8 copy fetched an astounding $12,600 at auction in 2022