Book of Eclipse

This is a good card only if you consider the first half of the card text. Unlike Book of Moon, you can both use it on your monsters and your opponent's monsters (if you so choose). And it works on all of the opponent's monsters. However, the draw effect totally kills this card. If the opponent draws even 1 card, this card becomes a minus. And there are more than 1 monsters on the field (even if you do use this card to its full ability), you're giving them an unacceptable amount of advantage by using this card.

Since only a deck that doesn't care about card advantage at all would run it, it has only been used in past Empty Jar decks (or possibly other autowins) and has no viability anywhere else.

Sun Fact: The Sun (by mass) has 99% of all the matter in our entire solar system.

Hello Pojo Fans,

Book of Eclipse is a side deck card that can help defend, but it comes at a cost.

A quick-play that can flip down everything on your opponents field is a great tech to save you from destruction...but your opponent gets a draw for each monster flipped up. You never want to give your opponent card advantage, but sometimes you have to make sacrifices. This card does stop their momentum, leaving them with no face-up monsters until the End Phase, and they won't be able to use their added cards until next turn. The best use of this card would be to prevent your demise, thus buying you a turn to defeat them before they can use their new cards. However, the danger of hand traps adds a new wrinkle to this card's playability.

Advanced-2/5
Art-3.5/5

Until Next Time
KingofLullaby

Ok, this is Solar Eclipse Week, it would be a mistake if we didn't review Book of Eclipse during this week.

Book of Eclipse allows you to change all monsters on the field to face-down Defense Position. This sounds nice, but will suck against Link Monsters, considering they cannot exist face-down or in Defense Position and face-down Attack Position isn't a thing, still neat though. During the End Phase, all monsters your opponent controls that are face-down are flipped face-up in Defense Mode and then your opponent draws cards equal to the number of monsters flipped this way. Yeah... letting your opponent draw cards is terrible.

Overall, this is still a very nice anti-meta card, ignoring the drawing part. Swords of Concealing Light is better in my humble opinion, but at least this is a quick-play. Put this in your side deck if the format calls for it.

Advanced Rating: 3.5/5

Book of Eclipse

There once was a time when the only reason this would actually see play is because either you or your opponent was playing Empty Jar and for no other reason was it played.

Then however being able to mass disrupt your opponent became a "Thing" a GOOD thing to do, especially with the initial advent of Pendulum Summoning and the ability to Special Summon as many as 5 monsters all at once... This of course required a countermeasure that could effectively end an opponent's turn... And Maxx "C" doesn't always cut it!
And even if the payoff cost of using this was that you provided your opponent with 5 new cards during the End Phase if you win on your next turn those cards are absolutely useless.
Of course Book of Eclipse can be and is used to also effectively escape at least some forms of mass destruction such as the Mirror Force series of cards and could also be used against Floodgate Trap Hole, but especially more useful if you've Summoned several monsters all at once and cannot really afford to have them left face down at the mercy of your opponent's card effects. But that is an extremely niche use and rather unlikely in the mainstream, but still, fun to consider.

Book of Eclipse is of course still very useful for preventing Sychro and Xyz Summons and in some cases Link Summoning (since Links cannot be Summoned by using a face-down monster(s) as well as preventing the effects of Synchro and Xyz monsters, however since Links cannot be flipped face-down, it is totally useless against them. BoE is also arguably useful against Decks that have monster(s) that cannot be Targeted by or destroyed by card effects... However you can destroy a monster(s) that cannot be destroyed by card effect(s) if they are face-down, and often this is one of the benefits of BoE when combined with Dark Hole for example. And then the additional advantage is that you also prevent your opponent from Drawing any cards off of BoE.

This card is less useful currently, but this is one of those versatile utility cards that always pops up when it is able to most have the best impact on the Meta.

Rating: 4.0. While currently Book of Eclipse should probably score lower than this, I have chosen to score it here with a score that I think best reflects its strength when it is a Meta card as I feel that it is very easy to give it a low score currently only for that score to be essentially invalidated in 6-12 (or however long) months time. However the score is also inflated because it doesn't Target and has a mass effect, that is its effect affects the entire field.