^ Well I made it up on the spot, so I seriously doubt it. [...]
Noone questioned that you made this deck by yourself.
Many of us discover the same synergies, decks, etc. independently which leads to similar decks. Eventually, this is fun because
similar decks are not the
same; players will try different versions later and it is possible that in the end a new, fun/effective/cheap/etc. deck gets created, made out of – independent – discoveries of several people. (Frankly, "good old decks" eg. Pestal had many experimental versions before the "most effective" was invented.)
However, "necro-posting" [adding an answer to a thread which had the last reply long, long ago] is not an error, as it comes to the Deck Ideas section. On the contrary, even the admins appreciate it (as far as I know).