Judge Tower DCI Sanctioned Paper
Judge Tower, or Judge's Tower, is a casual, constructed Magic: The Gathering format that was created as a training technique for Judges who need to keep track lots of things at once. 
Rules [ ]
All players share a 250 or 175
card deck and a graveyard. You own every card you draw for purposes of things like Homeward Path. Begin the game with 0 cards in
hand. You must
play every card in your hand as soon as legally possible. All optional modes are mandatory, to the extent that you can fulfill them. You must activate every
activated ability of permanents you control once per turn per legal target as soon as legally possible. Always activate abilities from the bottom of the card up. If a spell or ability has X in its mana cost, X is always 5.
attack with all legal attackers and Block with all legal blockers whenever the option is presented to you. All players have infinite
life. All players have infinite
mana. You lose the
round if you commit a game rules violation. Play the game until there’s a winner, that winner gets a point, then exile all permanents, all cards in the graveyard, and all cards in hands and start the next round. When the deck is empty, the player with the most points wins!
References [ ]