I prefer to mix it up, because it tends to confuse the opposition.  I was playing my version of Trix, it was Forbidden Crypt + Donate + Tormod's Crypt, but playing with 4 Misdirection, 3 foil.  

Well I had used the three foil, and was sitting on the non-foil one in my hand (I got extremely lucky topdecking) My opponent decides to cast the last thing is her hand, a Fireblast, well I go ahead and pop the Misdirection.  This story helped me learn that having that non-foil one helped me win due to her thinking that I was only playing three because if I was running a 4th it would have been foil.  

When I build decks now I tend to "mix it up"

My name is Derek Patstone.  I started playing around 6th edition.  A for the decks that I play, well they tend to be rogue builds that no one would ever expect.

My collection, is on the larger side, with mostly newer cards. I have built up and sold several sets of Judgment and Legions.  Other than that nothing much.