Forum:Activation of a card with cost

Just a simple question: What is the right proper way of playing or activating a card effect that requires a cost (ex. discarding a card)? Should you pay the cost first before revealing the card that you are going to use or reveal first then pay the cost?

Thanks!

112.198.64.15 (talk) 06:30, March 27, 2013 (UTC) JDD