MANAHIVE

Equivalent cards to Terror of Kruin Pass (red Werewolf with a strong ability that grants keyword to all Werewolves, and can transform):
1. Instigator Gang

• Color: Red
• Granting ability to all Werewolves: Gives +1/+0 to attacking creatures (transformed: Wildblood Pack gives +3/+0 to attacking creatures).
  2. Geier Reach Bandit
• Color: Red
• Transforms into Vildin-Pack Alpha and gives all Werewolves you control the ability to transform immediately.
  3. Breakneck Rider
• Color: Red
• Transforms into Neck Breaker, making attacking creatures you control get +1/+0 and trample.

These are all red Werewolves that boost your creatures and have a transform clause at upkeep. Terror of Kruin Pass is unique in giving menace, but these offer similar synergies and transformation mechanics.