doubts regarding the ''mixing'' of cards or not

hi all, yup wld like someone to enlighten me on this burning question i have.....is it ok for me to mix cards, say for e.g. Kagerou cards ( Vortex Dragon ) into my current Royal Paladin card deck...cos i alrdy modified my deck in such a way its all Royal Paladin, can i add cards from other nations into my current RP deck??

wat i experience abt it
u can mix it if u can balance your deck is fine that u mix
but trigger actived cant give to mix

example your trigger is Royal Paladin u cant give to kagego

You can give to Kagero as long as you have the same clan on the field.