Fangblade Thief 3R
Creature - Human Werewolf (Uncommon) 1R: Fangblade Thief gets +1/+0 and First Strike until the end of turn.
Creature - Werewolf (Uncommon) 1R: Bladefang Eviscerator gets +1/+0 and First Strike until the end of turn. 4R: Creatures you control get +2/+0 until the end of turn.
Go wide or go tall? With this Werewolf, you and your howlpack have options.
Very minor complaint, but I wish the front half creature type included Rogue too. It's a thief, after all.
The card itself seems strong, but 4/5 drop creatures have been so pushed lately that this still feels like it may be replacement-level as a 4 drop for your limited werewolves deck. Maybe I'm underrating it a bit but this doesn't feel like something that pulls me strong into werewolves/red, more just a "nice to have" if I'm already there.