File:Blizzard-logo.gif

Summary
From: http://www.blizzplanet.com/images/partners/blizzard-logo.gif Or: http://www.blizzard.com/shared/blizz-com/images/links/blizzard-logo-large.gif

The logo at Image:Blizzard_Entertainment_logo.png is kind of tweaked (look at the letters used for ENTERTAINMENT ), so this is a good alternative even if it is a GIF.