If I have Teferi's Realm, does my opponent get a chance to respond when I pick a mode, or does that get picked when it resolves?
Also if I have a way to make infinite mana (specifically high tide x2 + candelabra of tawnos + capsize + sufficient number of Island), how would I shortcut this in a serious tournament? What would I specifically have to say?
You select the type for Teferi's Realm upon resolution. Your opponent will not be able to respond to that choice.
You must demonstrate that you have a repeatable set of actions in order to use a shortcut. In this instance, you would demonstrate that you can use the Candelabra, bounce it with a Buyback'd Capsize, and repeat the loop. You would then state how many iterations of the loop you would like to perform.
If I have Teferi's Realm, does my opponent get a chance to respond when I pick a mode,
There is no mode here.
700.2. A spell or ability is modal if it has two or more options in a bulleted list preceded by “Choose
one —,” “Choose two —,” “Choose one or both —,” “Choose one or more —,” “[A specified
player] chooses one —,” or similar. Each of those options is a mode.
It's not a decision made as the ability is put on the stack, therefore it is made during resolution. Players would not get a chance to respond between that decision and the phasing out.
608.2d If an effect of a spell or ability offers any choices other than choices already made as part of
casting the spell, activating the ability, or otherwise putting the spell or ability on the stack, the
player announces these while applying the effect. The player can’t choose an option that’s
illegal or impossible, with the exception that having a library with no cards in it doesn’t make
drawing a card an impossible action (see rule 120.3). If an effect divides or distributes
something, such as damage or counters, as a player chooses among any number of untargeted
players and/or objects, the player chooses the amount and division such that at least one player
or object is chosen if able, and each chosen player or object receives at least one of whatever is
being divided. (Note that if an effect divides or distributes something, such as damage or
counters, as a player chooses among some number of target objects and/or players, the amount
and division were determined as the spell or ability was put onto the stack rather than at this
time; see rule 601.2d.)
Also if I have a way to make infinite mana (specifically high tide x2 + candelabra of tawnos + capsize + sufficient number of Island), how would I shortcut this in a serious tournament? What would I specifically have to say?
You would have to describe your intentions with enough detail to be understood, and the opponent would have a chance to respond.
716. Taking Shortcuts
716.1. When playing a game, players typically make use of mutually understood shortcuts rather than
explicitly identifying each game choice (either taking an action or passing priority) a player makes.
716.1a The rules for taking shortcuts are largely unformalized. As long as each player in the game
understands the intent of each other player, any shortcut system they use is acceptable.
716.1b Occasionally the game gets into a state in which a set of actions could be repeated
indefinitely (thus creating a “loop”). In that case, the shortcut rules can be used to determine
how many times those actions are repeated without having to actually perform them, and how
the loop is broken.
716.2. Taking a shortcut follows the following procedure.
716.2a At any point in the game, the player with priority may suggest a shortcut by describing a
sequence of game choices, for all players, that may be legally taken based on the current game
state and the predictable results of the sequence of choices. This sequence may be a nonrepetitive
series of choices, a loop that repeats a specified number of times, multiple loops, or
nested loops, and may even cross multiple turns. It can’t include conditional actions, where the
outcome of a game event determines the next action a player takes. The ending point of this
sequence must be a place where a player has priority, though it need not be the player proposing
the shortcut.
Example: A player controls a creature enchanted by Presence of Gond, which grants
the creature the ability “{T}: Put a 1/1 green Elf Warrior creature token onto the
battlefield,” and another player controls Intruder Alarm, which reads, in part,
“Whenever a creature enters the battlefield, untap all creatures.” When the player has
priority, he may suggest “I’ll create a million tokens,” indicating the sequence of
activating the creature’s ability, all players passing priority, letting the creature’s ability
resolve and put a token onto the battlefield (which causes Intruder Alarm’s ability to
trigger), Intruder Alarm’s controller putting that triggered ability on the stack, all
players passing priority, Intruder Alarm’s triggered ability resolving, all players passing
priority until the player proposing the shortcut has priority, and repeating that sequence
999,999 more times, ending just after the last token-creating ability resolves.
Private Mod Note
():
Rollback Post to RevisionRollBack
Why bother with mere rulings when so many answers can be found in the Rules?
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Also if I have a way to make infinite mana (specifically high tide x2 + candelabra of tawnos + capsize + sufficient number of Island), how would I shortcut this in a serious tournament? What would I specifically have to say?
You must demonstrate that you have a repeatable set of actions in order to use a shortcut. In this instance, you would demonstrate that you can use the Candelabra, bounce it with a Buyback'd Capsize, and repeat the loop. You would then state how many iterations of the loop you would like to perform.
There is no mode here.
It's not a decision made as the ability is put on the stack, therefore it is made during resolution. Players would not get a chance to respond between that decision and the phasing out.
You would have to describe your intentions with enough detail to be understood, and the opponent would have a chance to respond.