2017-09-29 : If a permanent has {X} in its mana cost, X is considered to be 0.

2017-09-29 : In a multiplayer game, if a player leaves the game, all cards that player owns leave as well, and any effects that give the player control of permanents immediately end.

2017-09-29 : The control-change effect of Entrancing Melody lasts indefinitely. It doesn’t wear off during the cleanup step.