Yu-Gi-Oh

[Gondor Reficul]

Book of Moon puts a monster in face-down defense mode.

[Yoherz]

I know, but the only real thing it could do is put your monster in defense mode so you don't take damage from an attack if your monster is in attack mode, or to use flip effects more than once. Other than that, it's not gonna be that useful.

[Gondor Reficul]

True. I wouldn't use the card to exactly save myself from taking damage, rather use a flip effect again or something. Tsukiyomi can do it every time it's summoned...and it's a Spirit. >>

[Yoherz]

Yeah, which makes more sense. That's a repeatable effect, even if it isn't that helpful.

[Gondor Reficul]

It is with cards like Nobleman-Eater Bug and Magician of Faith.

[Yoherz]

But they banned Magician of Faith, and the only person I know that uses Nobleman Man-Eater is Charlie in his insect deck.
That's what I was saying, though. Flip it down to use an effect again or to avoid damage from an attack (either your monster or theirs). Otherwise, it's practically useless.

[Gondor Reficul]

Not entirely. But if it's limited, then yeah, it is.