Let’s be honest.  Nobody likes Spiders.  If they aren’t getting in your way, they’re shooting webs or fire at you.  The Spider Speed Limit Bonus Card is relatively inexpensive and can be a useful way of dealing with them.  It slows all Spiders by 25% when you use it and can be upgraded to slow them by up to 50%.  This includes slowing down the stuff they’re shooting at you.

Why is it worth it? It affects ALL Spiders, not just some of them.  With Floors that are completely stocked with Spiders from floor to ceiling, this is a powerful Bonus Card even without being upgraded.  Slower Spiders are much easier to Stomp or avoid.