These cards look identical but have different Dot Code strips when you run them through the e-Reader
Destined Rivals X TRAP If you control "Blue-Eyes White Dragon" or "Dark Magician": Negate the effects of all face-up monsters your opponent currently controls, until the end of this turn
The most important changes from a traditional tutor definition are that I consider searching any players library to gain access to a card to be tutoring, and that the selected card need not go into your hand, but to an alternate location where it is easier to cast or access the card than your deck
Black and green also just have great cards in Commander to round out your decklist, with plenty of mana ramp, color-fixing, removal options, and card draw
In fact, some decks completely fall apart if they lose their cards this way
Still, this does pressure your opponent every time you turn it sideways, and it gets a little more interesting if you can take suspect away from it, which there are a few ways to do in this format