1: good old placeholder,survives 1 shot to trap crab.
2: vs crab terraform pillar cluster, silo quake
3: widow, emp crab when it moves, it will not curl up into defensive mode
4: Sumo speaks for itself
5: racketeers
6: skuttle when crab moves
7: heavy transport in a not heavy aa area,gnats can work as escort if it moves.
8: impalers vs stationary crabs
9: tremor is well, can flatten the terraform.
10: cloaks can go snipers, or cloaked zeuses to catch off moving crab,or conjurer + a few ticks
11: hovers can go with penetrator/lance,they are cheaper and has some good uses.
12: a few jacks can make it work, but its situational
13: resign 2 op 4 me.
these are what I could think of,not all of them works,depending on the spider player,how much he loves to babysit his cute craby