Cockatrice

Cockatrice was originally a green creature type that was only used once, for the card Cockatrice in Alpha. Cockatrices are flying creatures that can turn their enemies to stone, much like Basilisks. They have lithe, feathery, serpentine bodies with the head of a bird, two legs, and two wings.

In Magic 2014 it finally returned as a black creature (Deathgaze Cockatrice). It was argued that though deathtouch suited both colors, green didn't get flying creatures anymore  However, Journey into Nyx added the green / blue Fleetfeather Cockatrice

Storyline

 * A cockatrice was once summoned by Jared Carthalion when he was inside Castle Melmereth. It both killed and was destroyed by a Clockwork Avian.
 * Another cockatrice was once contained inside an Armageddon Clock, and powerful enough to cause Armageddon.