Wizards website does feature a handy store locator if you dont know where your nearest LCS is
So many of the cards in the deck put +1/+1 counters on your creatures for minimal effort, and with certain other cards, those counters can stick around even if the creatures with them get removed
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
Due to how unique the effect is and its lack of reprints, this is the most expensive card in the drop at around $17
Amazon does, however, have similarly impressive deals on the Marvel's Spider-Man Play Booster Box ($127) and the recently launched Avatar: The Last Airbender Play Booster Box ($142)
A basic example of this would be a card like Relentless Rats, a rat that gets stronger when more copies of the same card are played