Designers often have a specific idea of how their cards will be received by players. Naturally, the accuracy of these predictions is far from guaranteed.
Here at Goblin Artisans, we give and receive frequent feedback on designs. I suspect all of us are getting good at predicting how other designers will view our cards. However, I don't think this feedback is a valid substitute for the perspective of an inexperienced player. It's one thing to pontificate on how cleanly a card reads, how intuitive a mechanic feels, et cetera; it's quite another to actually hand a deck to somebody who's never played Magic before and see what they do with it. Sure, I've read Mark Rosewater's explanations of what new players do and don't understand, but I haven't experienced it firsthand since 1994.

Cool Card Design of the Day