#control change

When a creature changes controllers, it becomes “summoning sick” again. This is because a creature can’t attack or use abilities with the tap or untap symbols in the cost if they haven’t been under their current controller’s control since that player’s most recent turn began.

If control of an attacked planeswalker changes at any point during combat, that planeswalker is removed from combat. It’s no longer being attacked. (Similarly, an attacking or blocking creature that changes controllers is removed from combat and is no longer attacking or blocking.) Any creature that was attacking a planeswalker that was removed from combat this way is still an attacking creature, but it won’t be able to deal any combat damage to the planeswalker (nor the defending player, since it wasn’t attacking that player).

Your opponent controlled Day of the Dragons when it left the battlefield, so they control that trigger and get the exiled creatures.

You contol Zada’s trigger and it exists independent of Zada.

Stop. Just in case you didn't know, you can control some of the things you complain about in life. Bad grades? study more! stop blaming it on the teachers bad "teaching habbits" because you're not always going to be lucky enough to get a good teacher. "oh my god, i have no friends, no one likes me..." STOP. All it takes is a simple "hello" or "Hi my name is _____" and soon enough you'll make a good friend or two. You might face some cold hearted people who turn you down instantaneously but that doesn't mean you should give up. Especially people who complain about their looks, seriously? You were made the way you were for a reason. Not every creature created was put on this earth to look at, what ever happened to brains? I think that's attractive as fuck. Even if that doesn't reassure you, I hope you know that there is a person who thinks you are the most handsomest/beautiful person.