There is no duty on cards, only HST/GST and brokerage fees that might be charged by carriers like UPS, Fedex, Canada Post or whoever delivers your package. Canada Post and Fedex don't tend to be bad, but UPS is a nightmare.
Ryan could conceivably save you brokerage fees and applicable taxes, if he claims an amount below the threshold to which Customs usually applies them. For example, if you have him receive $500 worth of cards and only claim their value at $40, then you've likely saved yourself $65 in HST. The only problem is that lying about value is illegal and places any seller/deliverer in a bad spot.