Magic The Gathering M13 Core Set Spoiler - Sublime Archangel

Sublime Archangel - #36/249 - Mythic Rare
Creature - Angel

Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Other creatures you control have exalted. (If a creature has multiple instances of exalted, each triggers separately.)

Illustrator: Cynthia Sheppard

Source: Wizards