To planeswalk is to put each face-up plane card and phenomenon card on the bottom of its owner’s planar deck face down, then move the top card of your planar deck off that planar deck and turn it face up.
July 3, 2020 · Core Set 2021
Monstrous is a designation that has no rules meaning other than to act as a marker that the monstrosity action and other spells and abilities can identify. Only permanents can be or become monstrous. Once a permanent becomes monstrous, it stays monstrous until it leaves the battlefield. Monstrous is neither an ability nor part of the permanent’s copiable values.
April 27, 2018 · Dominaria
The listed choices may be objects, words with no rules meaning that are each connected to a different effect, or other variables relevant to the resolution of the spell or ability.
September 30, 2016 · Kaladesh
rule 701.31b not present in this release
January 23, 2015 · Fate Reforged
Any time you have priority, you may turn a manifested permanent you control face up. This is a special action that doesn’t use the stack (see rule 115.2b). To do this, show all players that the card representing that permanent is a creature card and what that card’s mana cost is, pay that cost, then turn the permanent face up. The effect defining its characteristics while it was face down ends, and it regains its normal characteristics. (If the card representing that permanent isn’t a creature card or it doesn’t have a mana cost, it can’t be turned face up this way.)