Cards equivalent to Savageborn Hydra (RG, hydras, double strike, or scalable power):
- Primordial Hydra (scalable size, Green)
- Managorger Hydra (scales with spells, Green)
- Apocalypse Hydra (scalable with X, Red/Green)
- Grunn, the Lonely King (doubles power when attacking alone, Green)
- Zada, Hedron Grinder (copies effects, Red but not a hydra)
Reason: All cards listed are Gruul-colored (RG) or mono-Green hydras with scalable size or doubling power effects.