Tracking on Turn 1 is ok against some classes. If you suspect that you are going to face super aggro such as Warlock or Paladin you should have early removal. If you don't have that in hand you need it by Turn 2 pretty much.
Newer players to CCG's often feel worse about being milled than they really should. Chances are, you likely won't see those discarded cards in your game anyway. You want to maximize your chances to win, or at least be in the best possible position, *now*. Nothing else matters.
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