Corvus Griffin

Defender, flying
Mount 2 (At the beginning of combat, you may tap a creature you control with power two or greater. If you do, Corvus Griffon may attack as though it did not have defender until end of turn. Corvus Griffin gets +X/+0 where X is the tapped creatures power.)
"The Corvus have great respect for the unlawful nature of the humans that moved into their territory. Now they even fight as one.