>>534615515
Card changes are temporary, it doesn't lock in the type of card with card lock, it locks in the specific card that's there.
Best way to think about it is that Artoria is QAABB. Her first card is Quick, second is Arts, third is Arts, fourth is Buster, fifth is Buster.
When the game draws a hand it will pull a random card from any cards it hasn't already pulled recently, so if it pulls Saber 1, Saber 2 and Saber 4, you have a Quick, Arts and Buster for her. If Saber turns them all Buster, it just changes how they act for calculations, but they are still "Saber 1", "Saber 2" and "Saber 4". If you lock them they will just go back to being their usual card type on the second and third turn.