Mirrorshell Crab

five generic mana one blue mana Artifact Creature — CrabPower and toughness5/7

Ward three generic mana (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Channel — two generic mana one blue mana , Discard this card: Counter target spell or ability unless its controller pays three generic mana .

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Showing Kamigawa: Neon Dynasty#63

Price

0.33 $

Foil 0.37 $

12 printings

Daily estimate from Scryfall, not a shop quote.

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Mirrorshell Crab rulings

2022-02-18
If a player casts a spell that targets multiple permanents their opponent controls with ward, each of those ward abilities will trigger. If that player doesn't pay for all of them, the spell will be countered.
2022-02-18
Discarding the card is part of the cost to activate a channel ability.
2022-02-18
If a channel ability requires a target, you may not activate it without a target just to discard the card.

Mirrorshell Crab keyword rules

Ward Rule 702.21

Ward is a triggered ability. Ward [cost] means “Whenever this permanent becomes the target of a spell or ability an opponent controls, counter that spell or ability unless that player pays [cost].”

Some ward abilities include an X in their cost and state what X is equal to. This value is determined at the time the ability resolves, not locked in as the ability triggers.