Spectral Bears

Creature — Bear Spirit    (CMC:2)

Whenever Spectral Bears attacks, if defending player controls no black nontoken permanents, it doesn't untap during your next untap step.

"I hear there are bears—or spirits—that guard caravans passing through the forest."

131 ME1 • ENPat Morrissey

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Legal in: Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

8/1/2008
The checks for black cards is made both at the time you declare attackers and as the ability resolves. If there are any at the time attackers are declared, it won't trigger at all. If there are any at the time it resolves, the ability will do nothing.