[c]Craterhoof Behemoth[/c] is the best example of this kind of creature
As the deck mostly consists of Wizards, Naban, Dean of Iteration allows us to double up on all of our Wizards ETB triggers at a very cheap mana cost
You cast the copy while the ability is resolving and still on the stack
WotC would probably lose money to start but players would still have to buy packs or spend a lot of time on the game, even with a dusting system, because the dusting conversion is so steep
P/T Number 191 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pauper, Timeless, Vintage Not Legal Formats Alchemy, Pioneer, Standard Rulings (10/4/2004) Because the "search" requires you to find a card with certain characteristics, you don't have to find the card if you don't want to
Take, as a famous example, Urborg, Tomb of Yawgmoth