Quote from Schutzwald »Runes of the Deus might be a good idea. That'll help make your Apocalypse Hydra be a nightmare for your opponent.
You could even slap that onto your general to get some damage in there that way.
Rancor would be pretty good too I feel like.
Quote from Incanur »As far as doublers go, Mana Reflection lets Rosheen tap for 8.
Quote from durkaaa »I have A Rohsheen Hydra tribal deck. If you are looking for Trample enablers, you could always try Nylea, God of the Hunt or Gruul War Plow. No primal vigor?