Pox | Magic: The Gathering
Formats Pox is Legal in
Official Oracle Text for Pox
Official Rulings for Pox
9/16/2007 : Each part of Pox's effect is processed separately. For each part, first the player whose turn it is makes all necessary choices (such as which cards to discard), then each other player in turn order chooses, then the actions happen at the same time. Then Pox's effect moves to the next stage.
9/16/2007 : The number you need to lose, discard, or sacrifice isn't calculated until it's time to perform that part of the effect. For example, if your opponent casts Pox and you discard Dodecapod as part of Pox's discard effect, Dodecapod will be put onto the battlefield instead of into your graveyard. Then, when determining how many creatures you need to sacrifice, the Dodecapod is taken into account.