Kjeldoran Warrior
French-vanilla in the most literal sense: a 1/1 for one mana with nothing but a keyword, and that keyword is the high-water mark of combat complexity the rules system ever produced. Banding does two counterintuitive things. On offense, it lets creatures attack as a single band that blocks resolve against as a group, so blocking any one member blocks the whole formation. On defense (and offense both), it hands the banding player the right to divide a blocked or blocking creature's combat damage, overriding the normal assumption that a creature's controller chooses where its own damage lands. That second clause is where decades of judge calls live, because it inverts who makes the decision. On a lone 1/1 the ability is inert: a single small body has nothing to fold into a band and no other attackers to leverage the damage-division trick. The card functions less as a playable creature than as a token of a design philosophy white commons were briefly asked to carry, when genuinely confusing combat math could be stapled to a one-drop. Banding was effectively retired from new design after the early sets precisely because of how much table-time it consumed and how poorly it read off the card: the reminder text here runs longer than everything else combined and still does not fully explain the interaction. A fossil of the most ambitious and least sustainable thing white aggro creatures were ever built to do.
