Ooze and Silence....
As to the ooze, it's one of the few low-cost creatures that can completely change the pace of the game for your opponent, especially early on if he's relying on weaps (say, control Warrior relying on his FWA for early board clearing). So I would always bring one ooze to the table, even against none weapon classes, it will always be a decent 2-drop.
But the 0-silence can be nice if you also have an Ancient Watcher: A 4/5 in Round 2 can be very nice (but you should only silence him in Round 3; first some player do not try to remove him, instead they will attack your other minions; but even if he manage to destroy him, you have at least your silence)
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