Forum:Tuner scheme vs brionic vs mist wyrm

ｉｎｔｏＡｂｔｈ

So if player A synchro for mist wyrm and calls priority and targets player B's 2 backrows and set monster, and player B responds with tuner scheme taking control of mist wyrm, does mist wyrm miss its effect because of the wording on mist wyrm effect reads "When this card is synchroed summon, return up to 3 cards your OPPONENT controls to his/her hand"

So it resolve something like tuner scheme comes first, then mist wyrms effect resolves but the control had already switched.

Same thing with brionic, if player A called priority and discards a card and targets player B's only backrow and chains tuner scheme, does brionic miss?

btw, for brionic's effect, can the player choose to discard as many cards from his hands at the same time to return up to the same amount of card... such as discarding 3 cards AT THE SAME TIME to return up to 3 cards his/her opponent controls