Ty decided once he got home from the mall with some nice treats he'd bought for himself to try something. So he'd learned that he had to alter something's physical state and its history to get the change to 'work' so people don't remember what it used to be like before he changed it. It seemed like it might be a good idea to see how he could use his wishes to alter reality based on the same principle.
Ty went up to his room, using his wish to make having the stuff he'd bought himself seem normal to his foster parents and Dustin, and decided to try this out. He focused his mind on something about the way the world was, and imagined making it both historically and physically different.
But what did he do it with, and how big did he aim? Was it a change to all of history or reality, or just something small affecting him? You choose...