Subterrors have been beatable since they were released.
I couldn't care less if they modify the requirements to activate such skill; it's nothing relevant for me, I don't see anything broken there, but more importantly, the deck will remain playable without Umbra & Lumis.
You think the skill is abused because you are terrible at this game. Period, that's the bottom line.
I don't see anything broken there <- then why the fk did they nerf it? maybe so you subterror slave can stop cheating and play like a man not a 🔥? ever thought of that route? or are you just that someone that always try to find the easiest way
They are modifying the skill because they are done with promoting Lumis & Umbra, that's all.
They wanted to make the new characters (not-so-new by now) relevant in the ladder. Subterrors can compete without that skill. Not difficult to understand, it's a very small regulation.
But it's a way to promote a character, it's obvious. When zane truesdale was released they did exactly the same with cyber style. They know it in the same moment they program he game. These guys are not Yu-Gi-Oh! Noobs such as yourself.
Bad News 4u
you are funny
