Tibalt's Trickery

• WWizards of the Coast2021-02-05
  Official Ruling
  If the spell has in its mana cost, they must choose 0 as the value of X.
• WWizards of the Coast2021-02-05
  Official Ruling
  If there aren't any nonland cards in that library with a different name than the countered spell, the player will exile all cards from their library, revealing all of them, and then they'll put those cards on the bottom of their library in a random order.
• WWizards of the Coast2021-02-05
  Official Ruling
  Tibalt's Trickery can target a spell that can't be countered. If Tibalt's Trickery resolves, the target spell won't be countered, but all of the other effects will still happen.
• WWizards of the Coast2021-02-05
  Official Ruling
  If a player casts a spell "without paying its mana cost," they can't choose to cast it for any alternative costs. They can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
• WWizards of the Coast2021-02-05
  Official Ruling
  If the spell that's countered was the back face of a modal double-faced card, no card in the player's library will have the same name as that spell because those cards all use only their front-face characteristics while in the library; however, if the first card the player exiles that has a different name than the spell is a modal double-faced card, they may cast either face, even if the back face has the same name as the countered spell.

Rulings via Scryfall

• WO
  Wizards of the Coast2021-10-13

  Tibalt's Trickery was banned in historic on October 13, 2021. Decks built around Tibalt's Trickery now use Throes of Chaos to boost the combo's hit rate dramatically, leading to a marked increase in win rate and popularity. The increased hit rate has pushed the deck over the line, and it is unlikely for Historic to safely include a combo of this speed and consistency. Source: https://magic.wizards.com/en/news/news/october-13-2021-banned-and-restricted-announcement
• WO
  Wizards of the Coast2025-06-30

  Tibalt's Trickery was banned in other on June 30, 2025. Pioneer Best-of-One on MTG Arena: In our Best-of-One formats, Tibalt's Trickery has regularly caused problems in a deck that aims to mulligan aggressively, play the card on turn two to counter their own spell, then put something huge and nasty into play. While the win rate numbers aren't terrible, it's a card that results in one-sided games with little interaction between players. Due to these factors, we are banning Tibalt's Trickery in Best-of-One Pioneer, as it is overall less fun on MTG Arena. Source: https://magic.wizards.com/en/news/announcements/banned-and-restricted-june-30-2025
• WO
  Wizards of the Coast2023-12-04

  Tibalt's Trickery was restricted in other on December 4, 2023. Timeless: These cards have earned their place on the restricted list based on their performance in our Historic No Banned List event. Source: https://magic.wizards.com/en/news/mtg-arena/introducing-timeless-a-new-mtg-arena-format