The plane card that’s turned face up is the plane the player planeswalks to. The plane card that’s turned face down or that leaves the game is the plane the player planeswalks away from. The same is true with respect to phenomena.
July 3, 2020 · Core Set 2021
rule 701.31d not present in this release
April 27, 2018 · Dominaria
If an effect gives a player multiple votes, those votes all happen at the same time the player would otherwise have voted.
September 30, 2016 · Kaladesh
rule 701.31d not present in this release
January 23, 2015 · Fate Reforged
If an effect instructs a player to manifest multiple cards from his or her library, those cards are manifested one at a time.