There's a couple ways to OTK with this card in Hunter, I'll highlight the two I see:
1. Dire Frenzy route - You Dire Frenzy your Dread Raven, then Scarlet Webweaver a Tundra Rhino (or two different Dread Ravens). Turn of OTK, you Rhino --> Raven --> Raven --> Raven, for 2+12+12+12, for up to 38 damage. Up to two of the Ravens do not need to be buffed by Dire Frenzy.
2. Hunting Party route - Scarlet Webweaver a Dread Raven (Unlike Frenzy, it HAS to be a Raven), then play Hunting Party twice, giving you 4 0-cost copies of Dread Raven. Then Tundra Rhino --> All ravens from hand, giving you 2+12+12+12+12 (50 damage), and you can play a fifth Raven to get an additional 27 damage. This route is also entirely comprised of Standard and Dragon cards, so it'll be around post set rotation too.
Both sides have their potential advantages - Dire Frenzy is more consistent, yet Hunting Party is better against Control Warrior because of the insane damage potential allowing you to OTK a Warrior at full health with 40+ armor. But the real fun part about this combo is the fact the entire combo is made up with Beasts or spells, so you can use Master's Call as a draw engine.
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