Cerulean Wisps — ruling 1

An effect that changes a permanent’s colors overwrites all its old colors unless it specifically says “in addition to its other colors.” For example, after Cerulean Wisps resolves, the affected creature will just be blue. It doesn’t matter what colors it used to be (even if, for example, it used to be blue and black).

Cerulean Wisps — ruling 2

Changing a permanent’s color won’t change its text. If you turn Wilt-Leaf Liege blue, it will still affect green creatures and white creatures.

Cerulean Wisps : règles, fonctionnement et interactions (MTG)

Cerulean Wisps 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

Target creature becomes blue until end of turn. Untap that creature. Draw a card.

Complete guide

Cerulean Wisps is a versatile blue instant that provides utility, tempo, and card draw all for the low cost of a single mana. Whether you need to surprise an opponent with an unexpected blocker or cycle through your deck, this spell is a staple for efficiency.

Color Shifting and Untapping

When Cerulean Wisps resolves, it performs three distinct actions in order. First, the target creature becomes blue, losing all its previous colors and color combinations. Second, that creature is untapped. Finally, you draw a card to replace the spell in your hand.

Understanding Color Changes

The color change effect overwrites all existing colors of the target creature because the card does not state the creature becomes blue 'in addition to its other colors.' If you target a red and green creature, it will be only blue until the end of the turn. Note that 'colorless' is not a color, so a colorless creature will simply become blue.

Common Misconceptions

Changing a creature's color does not alter its rules text or abilities. For example, if a creature has an ability that triggers when a green spell is cast, turning that creature blue will not change the requirement of that ability. Additionally, the untap effect occurs even if the creature is already untapped, and you will still draw a card regardless of the creature's initial state.

Strategic Timing

Because Cerulean Wisps is an instant, it is best used during an opponent's turn to ready a blocker or at the end of their turn to cycle for a fresh card. It can also be used in response to spells to change a creature's color if an opponent is using a color-specific removal spell or protection effect.

Interaction examples

Cycling Through Disruption

An Offer You Can't Refuse

Step 1: You cast Cerulean Wisps targeting a creature you control. Step 2: An opponent casts An Offer You Can't Refuse to counter your spell. Step 3: Cerulean Wisps is moved to the graveyard, and you create two Treasure tokens. In this scenario, you lose the card draw and untap, but gain mana acceleration for future turns.

The Counter Battle

Counterspell

Step 1: You cast Cerulean Wisps. Step 2: Your opponent attempts to stop your card draw by casting Counterspell. Step 3: Counterspell resolves, removing Cerulean Wisps from the stack. Because Cerulean Wisps never resolved, the target creature does not turn blue, does not untap, and no card is drawn.

Basic Utility

Step 1: You tap a creature for an ability. Step 2: You cast Cerulean Wisps targeting that creature. Step 3: The spell resolves; the creature becomes blue, untaps (allowing you to use its tap ability again), and you draw a card.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : Cerulean Wisps

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2008· Wizards of the Coast
An effect that changes a permanent’s colors overwrites all its old colors unless it specifically says “in addition to its other colors.” For example, after Cerulean Wisps resolves, the affected creature will just be blue. It doesn’t matter what colors it used to be (even if, for example, it used to be blue and black).
No other card is named in this ruling.
#2May 1, 2008· Wizards of the Coast
Changing a permanent’s color won’t change its text. If you turn Wilt-Leaf Liege blue, it will still affect green creatures and white creatures.
No other card is named in this ruling.
#3May 1, 2008· Wizards of the Coast
Colorless is not a color.
No other card is named in this ruling.