Ninjas were the most successful and well-liked aspect of the original Kamigawa block, and until we started adding more Ninjas through supplemental sets, Ninja of the Deep Hours was the one most responsible for flying that hard-to-detect flag playing significant roles in Pauper and Cube as well as Commander
I recently picked mine up in a lot of 13, so that was cool
This doesn't mean Raffine has to attack--you can attack with other creatures and still get the Connive trigger
Black and White-on We now have a lack of cards like Junk Arm, Smeargle, Dual Ball, Pokmon Collector, and Professor Oaks New Theory, among many others that we came to love in the HS-on format
But, if we discount that as merely a mini add-on to the 291-card March of the Machine, the smallest legitimate set is Arabian Nights , the very first 'expansion' set, released in December 1993 with just 92 cards