Mindless Null

Creature - Zombie 2/2, 2B (3)
Mindless Null can't block unless you control a Vampire.
Only a bloodchief can create vampires. The rest sire nulls, who become mindless beasts in their former bodies.
Illus. Karl Kopinski

Gatherer Card Rulings [Nov 2009]

• 10/1/2009: Whether you control a Vampire matters only at the time you declare blockers. Once Mindless Null blocks a creature, that won't change, even if all the Vampires you control leave the battlefield.

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