exclusive cards

i know this is an early question but are you going to have exclusive cards when the game gets to being a ccg/tcg or are all cards going to be able to be obtained by all players?

How should exclusive cards be obtained? The only idea we have currently – are tournaments and special events, where unique cards can be won.

or they could be only attained by achieving certain things, some simple like completing tutorials or beating ai’s, while others could be like accumulating certain points, while others might only be given to players who contributed to the game or you belive deserve them.