It is just a funky little dude, and I love It
While there were several competing styles of Survival decks around the time of its banning, the one that really ignited the controversy was Calebs Vengevine/Survival deck that would quickly put all its Vengevines into the graveyard, then play a couple of Basking Rootwallas for free, leading to extremely backbreaking assaults (frequently in the air, thanks to Wonder) that were immune to most forms of interaction
Spiders are a MTG creature type that's had a sprinkling of creatures in most every set
As mighty dragonstorms plunge Tarkir into turmoil and fierce dragons dominate the skies, the five clans join forces with their newfound Spirit Dragons in a bat
That means spells like Lightning Bolt, Chaos Warp, or Vandalblast get a second life, no mana needed
Priest of Titania 7 The other Rofellos