Hollow Warrior

Artifact Creature - Golem Warrior 4/4, 4 (4)
Hollow Warrior can't attack or block unless you tap an untapped creature you control not declared as an attacking or blocking creature this turn.¹
Though it moves like a living thing, anyone can tell it lacks a soul-not to mention mercy.
Illus. Adam Rex

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: This card can't tap itself to allow itself to attack or block. You have to tap a different creature which is not being declared as an attacker or blocker.

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