(Written) Book of Desires

[The Killer 687]

Normal Spell Card

At the start of your opponent's next Main Phase 1: Add 1 Spell Card from your hand or Graveyard to your opponent's hand. Your opponent must activate that Spell Card immediately. Your opponent doesn't pay the activation cost of that Spell Card.

[The Killer 687]

Effect updated. Now the enemy doesn't pay costs.

[Ruin]

This card is really op if you use spell cards like "Forbidden Dark Contract With The Swamp King" or "Dark Contract with the Gate"

[Flash Flyer - Sakura]

Recall that the opponent can still use the Contract's effects if they have suitable resources (mirror D/D), so it can backfire. However, it certainly serves as a field clog for the opponent which burns them. Trying to figure out what Spell Cards that you would want the opponent to play that have negative effects for its user, other than these.

[LordSPX]

The first card that comes to my mind is Darkworld Shackles.

Of course, you'll have to make sure you control no monsters and that the

opponent controls at least one at the time of activation.

[Guest BGMCANN0N]

You can force them to use Allure of Darkness and potentially discard their entire hand since the banishing DARK monster part isn't a cost. That enough is pretty scary, especially in early game, considering they have to use it before they can do anything. It is high risk, high reward though since DARK monsters are more common than most Attributes.

[Darj]

You can also force opponents to use Duality and Cards of Demise after using them yourself, and get their respective drawbacks applied on them. Giving them Big Cattle Drive to lock their Spell/Traps for the turn would be funny too, but they have to control at least 1 Beast/Beast-Warrior/Winged Beast monster for it to be activated. Or how about destroying their Special Summoned monsters and locking their Extra Deck through The Seal of Orichalcos? The latter can be done with March of the Monarchs as well, if you don't want to deal with the positive effects of Orichalcos. Yeah, this looks like a fun card to mess with.

 

Oh! Jam Breeding Machine would be a funny target for this card, too.