Not to mention Destiny Hero - Dogma's effect depends upon it being Special Summoned, for its effect to say, "right, in that case I'm going to trigger in the next Standby Phase". That means the monster must have the effect when it is Special Summoned. Destiny Hero - Dogma obviously has its own effect at that time, but Phantom of Chaos doesn't. As far as Phantom of Chaos is concerned, its Summon happened ages ago, and has no bearing on whatever effect it's stolen. It's something like Phantom of Chaos versus Monarch monsters, in that while you can steal the effect, it won't do anything.