
This creature 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.
Illustrated by Karl Kopinski
Released on October 2, 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.