Kaiba will still attack D.D warrior with it as long as his LP is not 0 after the calculation. And also not to forget those annoying enemy controller he has in his deck, this skill is useless against Kaiba cuz you also need to sacrifice two cards to create it.
the skill is not useless, ppl pair it with copies of dimension gate. Once you get dimension gate in your hand then you set it and activate your skill, on kaiba's turn you dimension gate your Wall and he won't attack
Ive been farming lvl 40 duelists with paradox bros since level 1 and im already lvl 18 and still have yet to receive this skill... FML
I played Mai from 1-35 got draw low level early... Use her exclusively to duel LDs have prob spent 20k+ keys overall getting 6-8k on everyone but kaiba... Still hasn't dropped HHG!
The drop rates/rng for skills is enough to make someone uninstall. That's what my bf did...
Edit: I just tried this without the skill but with 3x cocoons 3x labyrinth walls and 2x gates (ain't got 3 of them sadly). It can work, but it's far less reliable and kaiba will attack face down cards, likely ruining "victory by effect damage only".
This skill makes farming regular duelists great. Most decks they use can't break the wall (at lvl 50, only the Meteor Black Dragon and Masked beast can break it, which Masked beast can't even if you run S Spell Wall). This skill makes auto-duel's awful attempt-to-lose-at-all-costs tactic not an issue anymore.