2006-09-25 : Abilities that trigger “at the beginning of [your] upkeep” will trigger at the beginning of each additional upkeep as well.

2006-09-25 : If an effect causes the enchanted player to skip their upkeep step, this ability won’t trigger.

2006-09-25 : If echo triggers during the first upkeep, it won’t trigger again during the second upkeep since the creature won’t have enter the battlefield since that player’s last upkeep.

2006-09-25 : If two Paradox Hazes enchant the same player, they’ll both trigger when that player’s first upkeep of the turn begins. The player will get two additional upkeep steps.

2006-09-25 : Paradox Haze targets a player when it’s cast, and it enters the battlefield attached to that player.