I'm sorry if this has been brought up, but I guess creatures that get something perpetually, get it only until the end of the game? Do they go back to normal the next game you use them?
Yes, perpetual lasts only until the end of the game. (This includes not lingering into game 2 or 3 in a best-of-three match.)
Wizards Jay
Yes, perpetual lasts only until the end of the game. (This includes not lingering into game 2 or 3 in a best-of-three match.)