Question you might ask:
1. Can I use it? If yes, do I have to give credit?
Using it IS allowed as long as credit is given.
2. Are you gonna make decks with this in the future?
Yes, I will.
3. What if someone steals this?
I will say something like this: "Hello $username, I am sorry to say this, but your use of my sprunki body style has no credit given. Because of this, you have to give credit, or else remove the blueprint."
ANNOUNCEMENT:
So.. you guys were remixing my deck and changing the polo as your OC, or a canon character in original sprunki.
Well, the thing is I NEVER asked anyone to change the polo to be their OC. Like never, at all.
You are still able to use this style as long as you give credit.