Forum:How black horn of heaven negates special summoning twice

Ok my Bad I placed this in help desk forum by accident. Ok heres what happened: I played illusionary fusionist's effect to play blue eyes ultimate dragon and Opponent played black horn of heaven to negate special summoning and destroy it. I play Re-Fusion to bring back ultimate dragon and he says horn of black heaven means that I can't bring back blue eyes. Can someone please explain this to me?