No, don’t carry this. Waste of slot vs every other deck than SubT and even vs SubT isn’t even a guaranteed win. Unless you are in a Side deck format, it’s not advisable idea. Just like System Down vs Ancient Gears.
Doesn't work on flip monsters that aren't labelled as [Type/Effect/Flip] e.g. cards like Golem Sentry. Possibly an oversight on Konami's part, but worth keeping in mind.
Functionally, Guardian Sphinx works identically to how a Flip Summoned Flip monster would. It just doesn't activate from any other means of being flipped face-up. It's more apparent on monsters like Ghostrick Skeleton, which work IDENTICALLY to Flip monsters. They just aren't affected by cards like this, since they're not a Flip monster.
This card is active, no flip effects, man eater bug and hiro shadow scout become nothing but trash