The spider was added in Beta 5.2. Previous Versions can be found here.

Possible use may be as a rush card in a Bravery deck. In Beta 9.1, it was the second card to receive Haste, the other one being Lemon Bread.

It's not recommended to place this by itself against Justice as it will be killed by its passive effect.

Spider can also be useful in a deck with Muffet in it, since she gains +2/+1 whenever a Spider is played, even if the enemy plays it, and adds 3 Spiders to both player's decks. Adding more Spiders to your deck could give you the chance to give Muffet better stats.