It helps you be powerful when you are in a position to win, it doesn't help get you to the position where you can win and that is why it is a luxury card not an auto include
Maindeck artifact removal is much more common these days, but just a few years ago, Ensnaring Bridge was a lock in prison/stax decks, at least in game 1
It can even remove five +1+/1 counters to add two of each color of mana to your mana pool, allowing you to mutate multiple times per turn easily
Whenever you draw your second card each turn, target Detective can't be blocked this turn
Each pack contains 20 cards and 1 token/ad, with 2x legendary cards, 1x rare/mythic, 1x foil of any rarity, 3x uncommons, and 13x commons
That is 288 total cards for those of you keeping track at home, which is up from the 270 that are seen in a 6-person draft with 3 packs of 15