Keyword: Defender

Wall of Tombstones

Defender (This creature can’t attack.)
At the beginning of your upkeep, change Wall of Tombstones’s base toughness to 1 plus the number of creature cards in your graveyard. (This effect lasts indefinitely.)

Wall of Putrid Flesh

Defender (This creature can’t attack.)
Protection from white
Prevent all damage that would be dealt to Wall of Putrid Flesh by enchanted creatures.

Wall of Caltrops

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.)

Wall of Shadows

Defender (This creature can’t attack.)
Prevent all damage that would be dealt to Wall of Shadows by creatures it’s blocking.
Wall of Shadows can’t be the target of spells that can target only Walls or of abilities that can target only Walls.

Wall of Light

Defender (This creature can’t attack.)
Protection from black

Wall of Water

Defender (This creature can’t attack.)
: Wall of Water gets +1/+0 until end of turn.

Living Wall

Defender (This creature can’t attack.)
: Regenerate Living Wall.

Wall of Water

Defender (This creature can’t attack.)
: Wall of Water gets +1/+0 until end of turn.

Wall of Air

Defender, flying (This creature can’t attack, and it can block creatures with flying.)

Living Wall

Defender (This creature can’t attack.)
: Regenerate Living Wall.

Wall of Bone

Defender (This creature can’t attack.)
: Regenerate Wall of Bone. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

Wall of Brambles

Defender (This creature can’t attack.)
: Regenerate Wall of Brambles.

Wall of Bone

Defender (This creature can’t attack.)
: Regenerate Wall of Bone. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

Wall of Fire

Defender (This creature can’t attack.)
: Wall of Fire gets +1/+0 until end of turn.

Wall of Fire

Defender (This creature can’t attack.)
: Wall of Fire gets +1/+0 until end of turn.

Wall of Spears

Defender (This creature can’t attack.)
First strike