Mercurial Transformation is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Until end of turn, target nonland permanent loses all abilities and becomes your choice of a blue Frog creature with base power and toughness 1/1 or a blue Octopus creature with base power and toughness 4/4.
How it works : Mercurial Transformation
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You choose Frog or Octopus as Mercurial Transformation resolves, not when you cast it.
No other card is named in this ruling.
- #2· Wizards of the Coast
Lesson is a spell subtype found on some instant and sorcery cards in the Strixhaven set. The Lesson subtype has no special rules associated with it.
No other card is named in this ruling.
- #3· Wizards of the Coast
Although you may want to include Lessons in your sideboard if you’re playing with cards that instruct you to learn, Lesson cards can be included in your main deck like other instant or sorcery cards.
No other card is named in this ruling.
Legal formats
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Meta decks with Mercurial Transformation
No archived Top 8 deck with this card yet.




