Leyline of Mutation 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
If this card is in your opening hand, you may begin the game with it on the battlefield. You may payrather than pay the mana cost for spells you cast.
How it works : Leyline of Mutation
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
A player's "opening hand" is the hand of cards the player has after all players have taken mulligans. If players have any cards in hand that allow actions to be taken with them from a player's opening hand, the starting player takes all such actions first in any order, followed by each other player in turn order. Then the first turn begins.
No other card is named in this ruling.
- #2· Wizards of the Coast
If you cast a spell for another cost "rather than pay" its mana cost, you can't choose to cast it for any other alternative cost. You can, however, pay additional costs. If the spell has any mandatory additional costs, such as that of Abhorrent Oculus, those must be paid to cast the spell.
No other card is named in this ruling.
- #3· Wizards of the Coast
If a spell has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
No other card is named in this ruling.
- #4· Wizards of the Coast
If you cast a spell for which mana may be spent as though it were mana of any color, you may cast it for Leyline of Mutation's second ability's alternative cost and still spend mana as though it were mana of any color.
No other card is named in this ruling.
Popular combos
Real combos played by the community, sorted by popularity.
Morophon, the Boundless + Spider-Byte, Web Warden + Leyline of Mutation
- 1Cast Spider-Byte by paying
.
- 2When Spider-Byte enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Spider-Man 2099, Miguel O'Hara + Leyline of Mutation
- 1Cast Spider-Man 2099 by paying
.
- 2When Spider-Man 2099 enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Venser, Shaper Savant + Leyline of Mutation
- 1Cast Venser by paying
.
- 2When Venser enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Sparkcaster + Leyline of Mutation
- 1Cast Sparkcaster by paying
.
- 2When Sparkcaster enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Ancestral Statue + Leyline of Mutation
- 1Cast Ancestral Statue by paying
.
- 2When Ancestral Statue enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Whitemane Lion + Leyline of Mutation
- 1Cast Whitemane Lion by paying
.
- 2When Whitemane Lion enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Kor Skyfisher + Leyline of Mutation
- 1Cast Kor Skyfisher by paying
.
- 2When Kor Skyfisher enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Morophon, the Boundless + Dream Stalker + Leyline of Mutation
- 1Cast Dream Stalker by paying
.
- 2When Dream Stalker enters, it triggers, returning itself from the battlefield to your hand.
- 3Repeat.
Legal formats
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Meta decks with Leyline of Mutation
No archived Top 8 deck with this card yet.













