Formation is a rare Instant card from Ice Age (ICE), collector number 25. Current market price: $0.95, TCGplayer market prices via Scryfall.
Target 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.) Draw a card at the beginning of the next turn's upkeep.