Watchdog

Artifact Creature - Hound 1/2, 3 (3)
Watchdog blocks each turn if able.

As long as Watchdog is untapped, all creatures attacking you get -1/-0.¹
Its growl is a long, rumbling grind of gears and clockwork, its bark a blast of hissing steam.
Illus. Richard Kane Ferguson

Gatherer Card Rulings [Nov 2009]

• 4/1/2008: The second ability is no longer triggered. It continuously checks the tapped/untapped status of the Watchdog, and gives it -1/-0 as appropriate.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (1/6)	Tempest (Uncommon)