So if I do that to every card I draw, then it's a great mind game. I know this is a pretty grey area, but wouldn't that constitute as stalling?
You won't have to take too much time looking at your draws to make your opponent wonder if it was a Miracle card you pulled. Most of the time people take their draw and immediately add it to their hand. If you take even a second or two to look at it separately from your hand then they'll have reasonable evidence to believe what you just drew was a Miracle card.
So I wouldn't worry about stalling as an issue, as long as you don't take minutes to look at the draw.