Calling for a Friend

Call a friend of yours around your game table.
He can play a game, but it has to not be yours.
He has to choose 5 cards you have, in-game or
not, and use them against your opponents (That
means he can cast creatures on your side, put direct
damage to your opponent, etc).
All your creatures gain haste.
Then your friend roll a dice: you gain that much
life, and your apponents lose it.
If you don't kill at least one adversary this turn,
you lose the game.