Tetsuko Umezawa, Fugitive would be great since most of your stuff has 0 power it will make everything unblockable.

Consider adding Elspeth, Sun's Champion, as her -3 ability overlooks all of your creatures.

I‘m really surprised nobody has yet mentioned that High Alert and Axebane Guardian give infinite mana when having 4 other walls on the field. So definitely no need for the Staff of Domination . Which is why Villainous Wealth and Genesis Wave are missing here.

Also, I think it would be really funny and add some more flavor to add Aurification (even though it’s not a good card) making your opponents creatures to walls which can’t attack while yours can...

In case anyone cares, this is my attempt on a wall deck: Budget Walls

*This is the decklist: Budget walls yeah