Answer:
1. "Stardust Dragon's" negation effect must be activated in response to the effect it intends to negate. In the provided example, it is not possible to activate "Stardust Dragon's" effect to negate the effect of "Gladiator Beast Murmillo".
2. When the Turn Player Special Summons a monster with an inherent Special Summon effect, like "Cyber Dragon", "The Tricky", or "Dark Grepher"; they have priority and can activate the ignition effect of one of their monsters. ("Destiny Hero - Malicious", in this case)
Curtis Schultz
UDE Netrep
CurtisSchultz_Netrep@hotmail.com
"Removing your finger. That's a good power, Uncle Glen. I must have it..."