So my friend is playing Nissa, Vastwood SeerNissa, Sage Animist, which means she reveals a card most turns. Its a creature deck, so a lot end up on the battlefield, but some stuff doesn't. Our other friend is playing Kynaios and Tiro of Meletis, which means, combined with the fact that we're being nice to him, both that she's drawing more nonrevealed cards and that the game is going on and on. So we're kinda forgetting which cards we know the Nissa player has. Especially him, being new. Are there rules requiring her to keep revealed cards separate in some way? If I forget, am I allowed to ask her? If I am, but she forgets what got revealed, what happens?
In general, to reveal a card means only to "show that card to all players for a brief time", that is, "for as long as necessary to complete the parts of the effect that card is relevant to" (C.R. 701.16a). This is the case, for example, with Nissa, Vastwood Seer and Nissa, Sage Animist.
There are some effects that require players to reveal cards continuously, such as found in Courser of Kruphix or Sen Triplets; they have the form "play with [certain cards] revealed"; in general, cards have to be revealed for as long as such an effect is active and they meet that effect's criteria (C.R. 611.2a, 611.3b).
There are also spells that include revealing a card in their costs (e.g., Silvergill Adept), activated abilities that include revealing a card in their activation costs (e.g., ninjutsu [C.R. 702.48a]), and triggered abilities that trigger when a card is revealed (such as found in Rowen or Keranos, God of Storms). For such spells and abilities, the card in question is revealed until the spell or ability leaves the stack (or if the triggered ability isn't put on the stack at the appropriate time) (C.R. 701.16a).
EDIT (Sep. 6, 2020): Edited, including because one rule was renumbered in the meantime.
A player is not required to aid you in remembering stuff that happened in the game. That's each player's job and is what note taking is for (which means, you are allowed to forget, but she isn't, since these are her cards. But take note, that all players are responsible for keeping the game state clear.) However, once information becomes known to all players, you can ask for it later, it cannot be withheld, and you must be answered truthfully. But the other player is not required to keep it in your face.
A player is not required to aid you in remembering stuff that happened in the game. That's each player's job and is what note taking is for (which means, you are allowed to forget, but she isn't, since these are her cards. But take note, that all players are responsible for keeping the game state clear.) However, once information becomes known to all players, you can ask for it later, it cannot be withheld, and you must be answered truthfully. But the other player is not required to keep it in your face.
There appears to be a stunning number of players that take issue with this, especially the more “serious” players. What C.R. does this fall under? Game State?
I'd say this falls under free information as outlined in the MTR under Player Communication:
Free information is information to which all players are entitled access without contamination or omissions made by their opponents. If a player is ever unable or unwilling to provide free information to an opponent that has requested it, they should call a judge and explain the situation.
Free information consists of:
Details of current game actions and past game actions that still affect the game state.
The name of any visible object.
The number and type of any counter that isn’t defined as status information.
The state (whether it’s tapped, attached to another permanent, face down, etc.) and current zone of any object or player.
The game score of the current match.
The contents of each player’s mana pool.
The current step and/or phase and which player(s) are active.
A player always has to give all free information to their opponent accurately upon request. If that is not possible they should call a judge to help clear up the communication. If a player unintentionally misrepresents free information at Competitive Rules Enforcement Level, it may result in a Communication Policy Violation.
How does a resolved Nissa [+1] "still affect the game state" ?
The card is still in the hand, where it was put by Nissa's ability.
And how do you absolutely know that?
I disagree that this falls under Free information. Private information is described as:
Private information is information to which players have access only if they are able to determine it from the current visual game state or their own record of previous game actions.
Emphasis mine. The interpretation of this somehow being free information not only goes against the idea of needing to takes notes (and taking notes is permitted for exactly this reason) but also places an undue burden on the opponent. It is especially egregious when you start to consider the implications of this being Free Information. I Thoughtseize you and see Dark Ritual, Birds of Paradise, and an Island. I make you discard the Birds. Now, 3 turns later, I ask about Dark Ritual. But, you have cast Brainstorm in the meantime.
Under your interpretation of Free Information, you must now tell me where that Dark Ritual is. If it is in your library, how will that be proven? The only logical way is to show me the card. If you don't have that card anymore, and it is instead in the library, what recourse is there but to "prove" that it is not in hand by revealing your hand again? And, if it is still in your hand, why should you be forced to no longer be able to bluff about where that Dark Ritual went?
So, no, this is not Free information even if it had been revealed at one point in time. Being revealed, or another player being able to see it, never removes it from being private information. Free information covers only things in zones that are not hidden zones since there is a legitimate rabbit hole you go down by trying to ascertain information in a hidden zone turns later.
To the OP: no, there is no requirement that hidden, or private, information be constantly revealed simply because it was revealed at one point. Players are allowed to take notes for exactly this reason. Depending on your playgroup, some people will still play with the cards revealed out of a courtesy to other players but the rules do not require it.
Miracle is permanent if you didnt decide to cast it just reveal
702.92b If a player chooses to reveal a card using its miracle ability, he or she plays with that card revealed until that card leaves his or her hand, that ability resolves, or that ability otherwise leaves the stack.
Miracle is permanent if you didnt decide to cast it just reveal
702.92b If a player chooses to reveal a card using its miracle ability, he or she plays with that card revealed until that card leaves his or her hand, that ability resolves, or that ability otherwise leaves the stack.
It is revealed until the Miracle ability leaves the stack. It will not be permanently revealed.
Miracle is permanent if you didnt decide to cast it just reveal
702.92b If a player chooses to reveal a card using its miracle ability, he or she plays with that card revealed until that card leaves his or her hand, that ability resolves, or that ability otherwise leaves the stack.
The card with miracle stops being revealed due to miracle once that ability leaves the stack (among other circumstances), including as the last step of its resolution (whether or not the choice was made to cast that card) (C.R. 608.2k, 701.16a, 608.2d). The miracle ability means, in part, "When you reveal this card this way, you may cast it by ..." (C.R. 702.93a). (Compare miracle with Firestorm Phoenix [C.R. 108.1]).
EDIT (Feb. 21, 2021): One rule was renumbered in the meantime.
There are some effects that require players to reveal cards continuously, such as found in Courser of Kruphix or Sen Triplets; they have the form "play with [certain cards] revealed"; in general, cards have to be revealed for as long as such an effect is active and they meet that effect's criteria (C.R. 611.2a, 611.3b).
There are also spells that include revealing a card in their costs (e.g., Silvergill Adept), activated abilities that include revealing a card in their activation costs (e.g., ninjutsu [C.R. 702.48a]), and triggered abilities that trigger when a card is revealed (such as found in Rowen or Keranos, God of Storms). For such spells and abilities, the card in question is revealed until the spell or ability leaves the stack (or if the triggered ability isn't put on the stack at the appropriate time) (C.R. 701.16a).
EDIT (Sep. 6, 2020): Edited, including because one rule was renumbered in the meantime.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
There appears to be a stunning number of players that take issue with this, especially the more “serious” players. What C.R. does this fall under? Game State?
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
Awesome avatar provided by Krashbot @ [Epic Graphics].
The card is still in the hand, where it was put by Nissa's ability.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
I disagree that this falls under Free information. Private information is described as:
Emphasis mine. The interpretation of this somehow being free information not only goes against the idea of needing to takes notes (and taking notes is permitted for exactly this reason) but also places an undue burden on the opponent. It is especially egregious when you start to consider the implications of this being Free Information. I Thoughtseize you and see Dark Ritual, Birds of Paradise, and an Island. I make you discard the Birds. Now, 3 turns later, I ask about Dark Ritual. But, you have cast Brainstorm in the meantime.
Under your interpretation of Free Information, you must now tell me where that Dark Ritual is. If it is in your library, how will that be proven? The only logical way is to show me the card. If you don't have that card anymore, and it is instead in the library, what recourse is there but to "prove" that it is not in hand by revealing your hand again? And, if it is still in your hand, why should you be forced to no longer be able to bluff about where that Dark Ritual went?
So, no, this is not Free information even if it had been revealed at one point in time. Being revealed, or another player being able to see it, never removes it from being private information. Free information covers only things in zones that are not hidden zones since there is a legitimate rabbit hole you go down by trying to ascertain information in a hidden zone turns later.
To the OP: no, there is no requirement that hidden, or private, information be constantly revealed simply because it was revealed at one point. Players are allowed to take notes for exactly this reason. Depending on your playgroup, some people will still play with the cards revealed out of a courtesy to other players but the rules do not require it.
702.92b If a player chooses to reveal a card using its miracle ability, he or she plays with that card revealed until that card leaves his or her hand, that ability resolves, or that ability otherwise leaves the stack.
EDIT (Feb. 21, 2021): One rule was renumbered in the meantime.