I have never heard of an effect that uses those specific cards before. However, the gaffs in and of themselves are fairly common. So I would say you should research some effects that involve the same gaffs, and alter them to incorporate the spider theme of your cards.
Here is an idea to toss around in your head:
You show a packet of cards that has the following: two cards with empty webs, and two cards with a spider on a web. Claim that you have performed the effect twice already, hence the empty webs. Show the cards front and back, then call attention to one of the the webs that has a spider on it. Turn that card face-down in your hand, and set the others aside. Take a handful of dirt in your free hand, and set the face-down card on top of the dirt pile. After a moment of murmurring and concentration, lift the card to show that a spider is now in the dirt. Begin to breathe life into this spider. It comes to life! Set the dirt and the spider down and close the effect.
Given, this effect gets stronger as it goes along, and the cards themselves would probably take away from the power a little bit.
So perhaps you could simplify it by just making a living spider come out of the card without theatricizing it as much as I have illustrated.
I am simply saying that you shouldn't restrict yourself to effects that the cards have been printed for. Experiment with the cards and see what comes of it. Then you may have an effect that is far better than any intended specifically for the cards.