This applies only to cards with the same name, not just the same character
This card is a rare example of a monster which can interfere with the opponents Extra Deck, sending a monster from it to the Graveyard the moment its summoned, even before we talk about the destruction ability of its other effect
Castel, the Skyblaster Musketeer Castel is essentially two of Yu-Gi-Ohs most powerful cards wrapped into one monster: Compulsory Evacuation Device and Book of Moon
("Why are people against it?") I said they were a cross between transforming double-faced cards, which the majority of the players loved, and split cards, which the majority of the players loved
I believe that Synchros like him that are limited to the Type or Attribute instead of the Archetype or the Generic ones are those that are good to the game since they are splashable to a lot of Decks but not everywhere causing problems
On top of that you can find many unique cards that support a tribe and can be great budget options as those cards work only on a specific tribal deck and are bad to unplayable to any other deck