d4 opening - c5 move

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flatseven

I like to play c5 early in the game as black. The game below black was played by someone else, but this illustrates my point.  I first started playing this after watching Danny's Slav pwn structure videos.  I think of this as a way to get c5 in and also bring out my bishop. Is this common?  As white I do not mind playing an isolated pawn structure, on the other hand, which this may lead to.

6.Nc3