While it may be tempting to create exact replicas of official cards, doing so is a clear violation of copyright laws and can lead to legal consequences
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
For decks looking to build around these cards, Zur is simply the best choice to consistently fetch them up for you
Lethal Scheme is by and large a free spell, and we know how powerful those can be
When it was printed it was heavily played in kitchen table formats like early Commander and Five Color that dominated the format with their good answer to anything save for a black dork