We'll now have a pack of thirteen cards in our hand (remember, the player to our right took his first pick from it), and we get to take one card from it for our deck
Your opponent is going to have countermeasures, and by diversifying your sideboard package you force them to diversify those countermeasures, which means bringing in more cards than they would like and cutting into their core pieces
Your characters often gain the ability to summon powerful allies to assist them temporarily in battle
So its not a 100% equivalence like attacking wont cause the creature to tap and vigilance, or not affected by summoning sickness and haste
These cards are not only mechanically powerful, they would be valuable reprints even without the Transformers association
Legendary landwalk would be a better means of punishing and that would still be a long way from good