Interresting effect. Sadly it's an epic, so not useable by new players. The card is very very good in Arena if you get it, but because it's an epic, the chance is very low. In constructed it might be good, but far too slow. A 8/8 for 8 that does nothing when put on the field is not good.
Edit: didn't see that's a hunter card. So even worse. But it's a buff to Webspinner in wild (or for the few people that play ball of spider) or to Tomb Spider. For Tomb Spider this is quite a significant buff.
I'm surprised no one mentioned the insane synergy it has with Bestial Wrath or Stablemaster. It can wipe the enemy board 90% of the time while dealing 8 face damage and leaving a threatening 8/8 body that has to be dealt with. Assuming this lives for a turn, which it might given that BGH will most probably be nerfed. This card has potential.