Sirius Black

{2}{g/u}{g/u}: Transform Sirius Black.
{4}{g}{u}: Search your deck for a card named
Buckbeak, the Hippogriff and put it onto the
battlefield, then shuffle your library.
He squeezed Buckbeak's sides with his heels. The hippogriff took off into the air.....He and his rider
became smaller and smaller as Harry gazed after
them...then a cloud drifted across the moon....They
were gone.