1. New rule in OCG. First player no longer draws on their first turn.
2. Lightpulsar Dragon has a "When...you can..." effect, which can cause it to miss timing. Him going to the graveyard has to be the absolute last thing that happens for the effect to activate. If you tribute him for some kind of summon or certain card effects, he won't activate.
3. Illusion Gate might be a similar issue to the Lightpulsar thing, but since it's an anime card and I don't know what monsters are being destroyed by it, I don't know for sure.