The Battle Academy includes everything two players need to play, with guides to the decks so your first game is easy to follow
They have enough value across the board they sit in maindecks and not sideboards, but I dont think you see the current Azorius Control builds if these two cards werent so important against Living End and Temur Crashcade
The avalanche those artifacts and a few of their companions unleashed was so powerful that not only did several cards have to be banned, the power level had to be reworked and the game took over a year to readjust
If you're playing Hearthstone and know that the new meta is dominated by gurgling Murlocs, you'd normally have no option but to buy a dozen random packs and hope you draw what you need, putting a quite a lot of money into ActiBlizz's pocket along the way (and even then you're not guaranteed that you'll get the cards you want, potentially prompting further purchases)
However, I went out of order so as not to separate the two goblin tokens from the Tarkir block, one from each of Khans (Kev Walker, bottom left) and Dragons (Mike Bierek, second from bottom left), in what is yet another parallel to zombie tokens