Wall of Caltrops
Creature - Wall
Defender (This creature can't attack.)
Whenever Wall of Caltrops blocks a creature, if at least one other Wall creature is blocking that creature and no non-Wall creatures are blocking that creature, Wall of Caltrops gains banding until end of turn. (If any creatures with banding you control are blocking a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by.)
legal Legacy
legal Vintage
not legal Modern
not legal Standard
not legal Pioneer
legal Pauper
not legal Historic
legal Commander