Damage Gate lets you Special Summon a monster from the Graveyard with less ATK than the battle damage you took from an opponent's attack. With that being said, Labyrinth Wall has 0 ATK, so you can special summon it after taking any amount of battle damage.
Using this card's effect, you can set Labyrinth Wall face-down without needing any tribute. This will keep it hidden, making your opponent unable to switch the position and attack it first to flip it up.
-Pumprincess the Princess of Ghosts/ -
Wonder Balloon (to reduce attack)
-plus, any card that increase the labyrinth wall's defense, or reduce the opponent's monster attack. (+defense, -attack)
or Soul Exhange to set down another wall.
- summon the wall
- set the trap cards
- set, or activate Canyon
- set down any monster dummy, your choice. I prefer Crystal Seer, and
- They attack, activate Staunch Defender, choose the wall, and BAM. any damage will be DOUBLED, with Canyon.
ahh, yes. Exactly. That's why I said before, this deck is stupidly easy to counter.
There're tons of ways to destroy the wall, and it'll be sitting duck.