Dynamite asked me to pass along the link below for their new Vampirella Blind Bag crowdfunder and especially the sketch card tier. You can find details on their Kickstarter page:

Kickstarter - Vampirella Blind Bag

Looks like you must pledge $ 100 to get one of the cards and they passed the 33 K stretch goal so a second unknown card will be included

I wouldn't want a blank sketch card as a prize.