Wall creatures you control get +1/+0 and have banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Defender {3}, {T}: Target creature can't be blocked this turn.

Defender (This creature can't attack.) {T}: Add {G}.

Enchant creature At the beginning of your upkeep, put a +1/+1 counter on enchanted creature.

Choose target Wall creature. Whenever that creature is dealt damage by an attacking creature this turn, you gain that much life.

Defender (This creature can't attack.) At end of combat, exile all creatures blocked by this creature. When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners' control.

Defender, flying {W}: This creature can attack this turn as though it didn't have defender.

({T}: Add {B}.)

Defender, vigilance, reach, trample This creature can attack players who attacked you during their last turn as though it didn't have defender. Whenever this creature attacks, it gets +3/+3 and gains indestructible until end of turn.

Defender (This creature can't attack.) {G}, Sacrifice a Wall: Draw a card.

Enchant creature When this Aura enters, tap enchanted creature. Enchanted creature gets +20/+20.