Go to Jail

At the beginning of each player's upkeep, they roll two dice for each creature they control. If they roll doubles, the creature they rolled for is put in jail.
To put a creature in jail move it under a jail token marker. It is now in the jail zone and not on the field. At the end step of each turn each player can roll for every creature in the jail zone. If they roll doubles, that creature enters the battlefield under their control. Any can spend 50 mana to put a creature from the jail zone onto their si