Alliances — Uncommon
Artifact Creature Juggernaut
Urza's Engine rulings:
10/1/2008 : 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.
10/1/2008 : A maximum of one nonbanding creature can join an attacking band no matter how many creatures with banding are in it.
10/1/2008 : Creatures in the same band must all attack the same player or planeswalker.
10/1/2009 : If a creature in combat has banding, its controller assigns damage for creatures blocking or blocked by it. That player can ignore the damage assignment order when making this assignment.