Ok so I know it triggers itself.
But can someone please give me a concise explanation why?
technically they are simultaneous so you get to choose the order in which simultaneous things fire as the controlling player.
I'm not really sure that is accurate in this case. What is it simultaneous with? Surely, you couldn't choose to resolve an ability on a card before that card is rezzed.
Also, this should probably be merged with the rules thread.
If I remember correctly, when you rez the card it becomes active, but the "when a card is rezzed" window is still open, so card still has time to trigger off of itself.
If it didn't then Adonis and Eve would never get their credits put on them.