Gameplay » Shuffling
I play an Oracle, and search for two cards. While I am searching, I find that I have a HUGE energy pocket coming up. So I break it up and add some trainers in between them. I then shuffle and put 2 cards on top. Is that legal?
As long as you shuffle sufficiently afterward.
Source: PUI Rules Team (2004-03-25)
Gameplay » Shuffling
I was playing with this guy and he rearranged the order of the cards in his deck prior to shuffle it, would this be allowed in a tournament?
Yes but you would have the right to shuffle it yourself or cut it as well if you were uncomfortable with his shuffling method.
Source: WotC Chat (2000-09-15)
Gameplay » Shuffling
Is it illegal to randomly shuffle your deck, and if yes what are the penalties from doing so?
Yes it is illegal. The penalties depend on the tournament rules.
Source: WotC Chat (2000-08-31)
Gameplay » Shuffling
At any time during a battle, are you or your opponent allowed to shuffle your deck?
NO! [Ed. Note: This references shuffling at random times, not when appropriate]
Source: WotC Chat (2000-06-29)