116.3c Si un joueur a la priorité lorsqu'il lance un sort, active une capacité, ou effectue une action spéciale, ce joueur reçoit ensuite la priorité.

116.3c If a player has priority when he or she casts a spell, activates an ability, or takes a special action, that player receives priority afterward.

4.2 Tournament Shortcuts

A tournament shortcut is an action taken by players to skip parts of the technical play sequence without explicitly announcing them. Tournament shortcuts are essential for the smooth play of a game, as they allow players to play in a clear fashion without getting bogged down in the minutiae of the rules. Most tournament shortcuts involve skipping one or more priority passes to the mutual understanding of all players

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Certain conventional tournament shortcuts used in Magic are detailed below. If a player wishes to deviate from these, he or she should be explicit about doing so.

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• Whenever a player adds an object to the stack, he or she is assumed to be passing priority unless he or she explicitly announces that he or she intends to retain it. If he or she adds a group of objects to the stack without explicitly retaining priority and a player wishes to take an action at a point in the middle, the actions should be reversed up to that point.

Dans les faits l'arbitre donnera toujours raison au joueur qui essaye de gratter la priorité ? Même dans ce cas précis (Lightning Storm) ? Car clairement si le gars joue cette carte c'est pas pour faire un Volcanic Hammer à priori ^^

Une autre question : joueur 1 joue Lightning Storm, et veut défausser des terrains pour charger la mule. S'il n' pas annoncé avant de lancer Lightning Storm qu'il souhaitait garder la priorité l'arbitre va lui dire qu'il l'a dans l'os ou on admet qu'en jouant Lightning Storm et en défaussant de suite 10 terrains il a bien signifié à son adversaire qu'il ne passait pas la priorité de suite ?

Ben en compétitif oui. Il y a même encore plus vicieux comme coup : première phase principale de ton adversaire, tu lui demandes si tu peux jouer un sort, il te répond oui, tu ne joues rien, il joue un land ou un sort genre une créa puis il déclare ses attaquants, tu appelles l'arbitre et l'arbitre te donne raison. C'est salaud, mais si t'es mal en point contre agro ça te fait gagner un tour légalement.

A player may not request priority and take no action with it. If a player decides he or she does not wish to do anything, the request is nullified and priority is returned to the player that originally had it.

un joueur plutot malicieux on va dire, dit a son adversaire qui joue un sort "est ce que je peux repondre?" l'adversaire lui dit oui et l'autre reflechit et lui dit "ok c'est bon" le judge va t'il considerer que le sort est resolu?

A player may not request priority and take no action with it. If a player decides he or she does not wish to do anything, the request is nullified and priority is returned to the player that originally had it.

Ou j'ai loupé quelque chose?

4.2 Tournament Shortcuts
A tournament shortcut is an action taken by players to skip parts of the technical play sequence without explicitly announcing them. Tournament shortcuts are essential for the smooth play of a game, as they allow players to play in a clear fashion without getting bogged down in the minutiae of the rules. Most tournament shortcuts involve skipping one or more priority passes to the mutual understanding of all players; if a player wishes to demonstrate or use a new tournament shortcut entailing any number of priority passes, he or she must be clear where the game state will end up as part of the request.
A player may interrupt a tournament shortcut by explaining how he or she is deviating from it or at which point in the middle he or she wishes to take an action. A player may interrupt his or her own shortcut in this manner. A player is not allowed to use a previously undeclared tournament shortcut, or to modify an in-use tournament shortcut without announcing the modification, in order to create ambiguity in the game.
A player may not request priority and take no action with it. If a player decides he or she does not wish to do anything, the request is nullified and priority is returned to the player that originally had it.
Certain conventional tournament shortcuts used in Magic are detailed below. If a player wishes to deviate from these, he or she should be explicit about doing so. Note that some of these are exceptions to the policy above in that they do cause non-explicit priority passes.
• The statement "Go" (and equivalents such as "Your turn" and "Done") offers to keep passing priority until an opponent has priority in the end step. Opponents are assumed to be acting then unless they specify otherwise.
• A statement such as "I'm ready for combat" or "Declare attackers?" offers to keep passing priority until an opponent has priority in the beginning of combat step. Opponents are assumed to be acting then unless they specify otherwise.
• Whenever a player adds an object to the stack, he or she is assumed to be passing priority unless he or she explicitly announces that he or she intends to retain it. If he or she adds a group of objects to the stack without explicitly retaining priority and a player wishes to take an action at a point in the middle, the actions should be reversed up to that point.
• If a player casts a spell or activates an ability with X in its mana cost without specifying the value of X, it is assumed to be for all mana currently available in his or her pool.
• If a player casts a spell or activates an ability and announces choices for it that are not normally made until resolution, the player must adhere to those choices unless an opponent responds to that spell or ability. If an opponent inquires about choices made during resolution, that player is assumed to be passing priority and allowing that spell or ability to resolve.
• A player is assumed to have paid any cost of 0 unless he or she announces otherwise.
• A player who casts a spell or activates an ability that targets an object on the stack is assumed to target the legal target closest to the top of the stack unless the player specifies otherwise.
• A player is assumed to be attacking another player with his or her creatures and not any planeswalkers that player may control unless the attacking player specifies otherwise.
• A player who chooses a planeswalker as the target of a spell or ability that would deal damage is assumed to be targeting the planeswalker’s controller and redirecting the damage on resolution. The player must adhere to that choice unless an opponent responds.
• A player who does not scry (or look at the top card of the library after taking a mulligan) when instructed to is assumed to have chosen to leave the cards in the same order.
• In the Two-Headed Giant format, attacking creatures are assumed to be assigning combat damage to the defending team's primary head, unless the creature's controller specifies otherwise.
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Ben en compétitif oui. Il y a même encore plus vicieux comme coup : première phase principale de ton adversaire, tu lui demandes si tu peux jouer un sort, il te répond oui, tu ne joues rien, il joue un land ou un sort genre une créa puis il déclare ses attaquants, tu appelles l'arbitre et l'arbitre te donne raison. C'est salaud, mais si t'es mal en point contre agro ça te fait gagner un tour légalement.