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Judge of Currents

Card Name

Judge of Currents

Mana Cost

1

Type

Creature – Merfolk Wizard

Rarity

Common

rules Text

Whenever a Merfolk you control becomes tapped, you may gain 1 life.

Flavor Text

虽然渠道的潮流年年不同，美洛从未分不清身在何处、该往何方。

Legal Formats

Commander, Legacy, Modern, Pauper, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Pioneer, Standard

Rulings

(10/1/2007)
This is a triggered ability, not an activated ability. It doesn't allow you to tap the creature whenever you want; rather, you need some other way of tapping it, such as by attacking with the creature.
(10/1/2007)
For the ability to trigger, the creature has to actually change from untapped to tapped. If an effect attempts to tap the creature, but it was already tapped at the time, this ability won't trigger.