Emrakul, the Promised End

• WOTC Official Reminder Textofficial rules
  Protection — This permanent can't be damaged, enchanted, equipped, blocked, or targeted by [quality].

• WWizards of the Coast2025-01-24
  Official Ruling
  If the targeted player skips their next turn, you’ll control the next turn the affected player actually takes, and the extra turn the player takes will be after that turn.
• WWizards of the Coast2025-01-24
  Official Ruling
  Protection from instants means that Emrakul can’t be the target of instant spells or activated or triggered abilities from instant cards, and damage that would be dealt to it by instant spells or cards is prevented. Instant spells may still affect it in other ways; for example, it would still receive the bonus from Rally the Peasants.
• WWizards of the Coast2025-01-24
  Official Ruling
  While controlling another player, you can see all cards in the game that player can see. This includes cards in that player’s hand, face-down cards that player controls, and any cards in that player’s library the player may look at.
• WWizards of the Coast2025-01-24
  Official Ruling
  You can use only the affected player’s resources (cards, mana, and so on) to pay costs for that player; you can’t use your own. Similarly, you can use the affected player’s resources only to pay that player’s costs; you can’t spend them on your costs.
• WWizards of the Coast2025-01-24
  Official Ruling
  An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.
• WWizards of the Coast2025-01-24
  Official Ruling
  You can’t make any illegal decisions or illegal choices—you can’t do anything that player couldn’t do. You can’t make choices or decisions for that player that aren’t called for by the game rules or by any cards, permanents, spells, abilities, and so on. If an effect causes another player to make decisions that the affected player would normally make (such as Master Warcraft does), that effect takes precedence. In other words, if the affected player wouldn’t make a decision, you wouldn’t make that decision on that player’s behalf.
• WWizards of the Coast2025-01-24
  Official Ruling
  In a Two-Headed Giant game, gaining control of a player causes you to gain control of each player on that team.
• WWizards of the Coast2025-01-24
  Official Ruling
  You also can’t make any choices or decisions for the player that would be called for by the tournament rules (such as whether to take an intentional draw or whether to call a judge).
• WWizards of the Coast2025-01-24
  Official Ruling
  Protection abilities only apply while the object with the ability is on the battlefield. Notably, Emrakul may be the target of a spell that targets it while on the stack, such as Syncopate.
• WWizards of the Coast2025-01-24
  Official Ruling
  Controlling a player doesn’t allow you to look at that player’s sideboard. If an effect instructs that player to choose a card from outside the game, you can’t have that player choose any card.
• WWizards of the Coast2025-01-24
  Official Ruling
  You can’t make the affected player concede. That player may choose to concede at any time, even while you’re controlling that player.
• WWizards of the Coast2025-01-24
  Official Ruling
  While controlling another player, you also continue to make your own choices and decisions.
• WWizards of the Coast2025-01-24
  Official Ruling
  Multiple player-controlling effects that affect the same player overwrite each other. The last one to be created is the one that works. If multiple players have cast Emrakul and targeted the same player, each ability’s effect will create an extra turn.
• WWizards of the Coast2025-01-24
  Official Ruling
  While controlling another player, you make all choices and decisions that player is allowed to make or is told to make during that turn. This includes choices about what spells to cast or what abilities to activate, as well as any decisions called for by triggered abilities or for any other reason.
• WWizards of the Coast2025-01-24
  Official Ruling
  The player you’re controlling is still the active player during that turn.
• WWizards of the Coast2025-01-24
  Official Ruling
  You only control the player. You don’t control any of that player’s permanents, spells, or abilities.
• WWizards of the Coast2025-01-24
  Official Ruling
  If the targeted player loses the game while you control their turn during a multiplayer game, the extra turn never begins.
• WWizards of the Coast2025-01-24
  Official Ruling
  The card types that could appear in your graveyard are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Supertypes (such as legendary and basic) and subtypes (such as Human and Equipment) are not counted. The maximum discount that Emrakul’s own ability can provide is .

Rulings via Scryfall

• WO
  Wizards of the Coast2017-01-13 · edited

  Emrakul, the Promised End was banned in standard on January 13, 2017. People really just didn't like playing against Emrakul, which was nearly universal. While we generally enjoyed Emrakul in testing, by your third or fourth time it becomes incredibly frustrating. Removing Emrakul from that deck should make it more of a glass-cannon deck. Source: https://magic.wizards.com/en/news/latest-developments/standard-2017-01-13