Howlgeist

Creature — Spirit Wolf    (CMC:6)

Creatures with power less than Howlgeist's power can't block it. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

182 AVR • ENDavid Rapoza

™ & © 1993—2012 Wizards of the Coast

Legal in: Modern,Extended,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Howlgeist {5}{G} Creature — Spirit Wolf Creatures with power less than Howlgeist's power can't block it. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) 4/2

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View this MTG card on Gatherer

5/1/2012
The comparison of power is performed only when blockers are declared. Increasing the power of a blocking creature (or decreasing the power of Howlgeist) after this point won't cause any creature to stop blocking or become unblocked.

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Card Howlgeist is not on TCGPlayer.