Wall of Caltrops

Creature - Wall
Defender (This creature can't attack.) <CR>
Whenever Wall of Caltrops blocks a creature, if 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.)

Creature - Wall
Defender (This creature can't attack.) <CR>
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.)

Creature - Wall
Defender (This creature can't attack.) <CR>
Whenever Wall of Caltrops blocks a creature, if no non-Wall creatures are blocking that creature, Wall of Caltrops gains banding until end of turn.

Creature - Wall
Defender (This creature can't attack.) <CR>
Whenever Wall of Caltrops blocks a creature, if 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.)