Banding Sliver is a rare Creature — Sliver card from Mystery Booster Playtest Cards 2021 (CMB2), collector number 2. Current market price: $1.84, TCGplayer market prices via Scryfall.
All Slivers have 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.)