Magic: the Gathering - Datenbank

Banding (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 you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.) [T]: Counter target activated ability from an artifact source unless that ability's controller pays [W]. (Mana abilities can't be targeted.)