The card reads: You may choose an artifact or creature card with mana value 1 you discarded this way, then do the same for artifact or creature cards with mana values 2 and 3. In the right decks, you basically get to pay four mana to draw some cards and put six manas worth of cards into play
In Modern, it fits well into self-mill strategies given the landfall ability will help bring it back
Its a weird mechanic in that its a special action, which means that your opponent doesnt get priority to respond to it, even if there are timing restrictions on when you can use it
Mathas, Fiend Seeker is a Mardu Vampire commander that uses political bargaining to manipulate opponents' removal choices and gain advantage
Beyond this, most of the decks are are extremely lacking in good lands, which is disappointing
Draft Boosters are available on their own, or in a display box of 36 packs