"Armor Breaker" Rating Score by 戦士族大好き

It's one of those cards awaiting reprints and errata.
Unions have slightly different specifications around the 9th term, and after the 9th term, you can use effects even if you equip them other than your own effects.
A typical example would be the combination of 《Sublimation Knight》and 《Squeaknight》.
However, since this card has not been recorded since season 9, it cannot SS itself even if it is equipped with Koa'ki Meiru War Arms.
This is exactly reproduced in Master Duel, and you can see the excellence of the debug team.
If he is errataed, he will be able to make Isolde, Two Tales of the Noble Knights with this GY card and Koa'ki Meiru War Arms, which will increase his value.
If you just want to play Isolde, you can replace it with any number of other cards, so let's take advantage of this card's own effect.
It works particularly well with 《Spell Striker》, and thanks to its direct attack effect, you can use this card's effect, and the return damage will be 0, and this time, 《Spell Striker》will remain on the field as a substitute for this card's battle destruction. Since the level and attributes are the same, you can share support and aim for rank 3Xyz.
Since 《Squeaknight》is the same Union warrior, it will be a big barrier, but let's try to differentiate them by being EARTH and different levels.
By the way, if you equip 《Squeaknight》with 《Koa'ki Meiru War Arms》, you can properly SS yourself. Master Duel is amazing.