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They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack

Although, it is interesting that Webby Vanderquack Enthusiastic Duck is the only one of the bunch without an ability

Still, the entire point of equipment decks is to win with their assortment of cheap, powerful equipment cards and this card is far from cheap

You have either Fable of the Mirror-Breaker or Unexpected Windfall and Big Score to make that happen