With the shadow you start by hoping you get a SSA fast.
Any deck which has its strategy worded this way has to play the maximum number of the card in question, unless que card is tutorable (meaning, you can go find it in your deck), you are playing the maximum number of tutors, the card sucks in more than a singleton (so, once you have 1, you don't even want anymore of them) and the tutors can find other utility stuff. Since it clearly seems not to be the case, you should play 4 copies of it.