New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
I think choose the blocker should happen when the blocker would normally be put in battle, therefore getting rid of the choose the blocker issue.Something like you choose the blocker when the ability activates (or triggers or whatever you want to call it) and then when the evil character would normally come it that is when the character is brought into battle (this only applies to pre-block choose the blockers)