first twenty people to buy a Booster Box at participating locations receive this card:
Surgical Extraction (ϕB)
Instant (Rare)
(ϕ can be payed with either B or 2 life)
Choose target card in a graveyard other than a basic land card. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles his or her library.
source: New Phyrexia's Buy-a-Box card : Daily MTG : Magic: The Gathering