Entrancing Melody
Ixalan — Rare
Sorcery
Entrancing Melody rulings:
2017-09-29: If a permanent has in its mana cost, X is considered to be 0.
2017-09-29: The control-change effect of Entrancing Melody lasts indefinitely. It doesn’t wear off during the cleanup step.
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.