Talk:Priority

I have a question about priority. I overheard a conversation that the priority ruling does not exist in other parts of the world. The U.S. is the only country that has this. (for example if I summoned Mobius and my opponent played bottomless traphole, Mobius's effect never goes through.) I read the card carefully and it says "When this card is Tribute Summoned successfully, you can destroy up to 2 Spell or Trap Cards on the field." The word "SUCCESSFULLY" caught my attention. The only way a summon would not be successful is if the monster is destroyed after being summoned. Which would mean that if Mobius is not successfully summoned, it's effect would not go through. Now bear in mind that this is only something I overheard, so can anyone shed some light on this? -Curious