Bird creatures get +1/+1.
{1}{W}: Target Bird creature gains banding until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
Creatures in the same band must all attack the same player or planeswalker.
1 Oct 2008
If a creature with banding attacks, it can team up with any number of other attacking creatures with banding (and up to one nonbanding creature) and attack as a unit called a "band." The band can be blocked by any creature that could block a single creature in the band. Blocking any creature in a band blocks the entire band. If a creature with banding is blocked, the attacking player chooses how the blockers' damage is assigned.
1 Oct 2008
A maximum of one nonbanding creature can join an attacking band no matter how many creatures with banding are in it.
1 Oct 2009
If a creature in combat has banding, its controller assigns damage for creatures blocking or blocked by it.