Judge of Currents

Creature - Merfolk Wizard 1/1, 1W (2)
Whenever a Merfolk you control becomes tapped, you may gain 1 life.
Though the currents of the Lanes shift every year, the merrow never lose track of where they are or where they are going.
Illus. Dan Scott

Gatherer Card Rulings [Nov 2009]

• 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.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/9)	Lorwyn (Common)