History of CR 701.20a

To reveal a card, show that card to all players for a brief time. If an effect causes a card to be revealed, it remains revealed for as long as necessary to complete the parts of the effect that card is relevant to. If the cost to cast a spell or activate an ability includes revealing a card, or if a card is revealed because an ability is activated from a hidden zone (see rule 602.2a), the card remains revealed from the time the spell or ability is announced until the time it leaves the stack. If revealing a card causes a triggered ability to trigger, the card remains revealed until that triggered ability leaves the stack. If that ability isn’t put onto the stack the next time a player would receive priority, the card ceases to be revealed.

To shuffle a library or a face-down pile of cards, randomize the cards within it so that no player knows their order.

To tap a permanent, turn it sideways from an upright position. Only untapped permanents can be tapped.

To “fateseal N” means to look at the top N cards of an opponent’s library, put any number of them on the bottom of that library in any order and the rest on top of that library in any order.

To clash, a player reveals the top card of his or her library. That player may then put that card on the bottom of his or her library.

A player may planeswalk only during a Planechase game. Only the planar controller may

A player may planeswalk only during a Planar Magic game. Only the planar controller may

A player may planeswalk only during a Planar Magic game. Only the planar controller may planeswalk. See rule 901, "Planar Magic."

A player may planeswalk only during a Planar Magic game. Only the planar controller may planeswalk. See rule 901, “Planar Magic.”

A player may planeswalk only during a Planar Magic game. Only the planar controller may

A player may planeswalk only during a Planar Magic game. Only the planar controller may planeswalk. See rule 901, "Planar Magic."