I don't see why people don't use Enemy Controller nowadays.
Enemy Controller
Quick-Play Spell Card
Card Text:
Activate 1 of these effects.
● Target 1 face-up monster your opponent controls; change that target's battle position.
● Tribute 1 monster to target 1 face-up monster your opponent controls; take control of that target until the End Phase.
This card is so good on so many levels. Let's say your opponent has BLS on the field. You have a monster in your hand and you draw into Enemy Controller. Summon the monster, then use Enemy Controller on it and target BLS. Boom! Your opponent gets a -1 for the turn and you get a giant monster that you can actually attack with! You can use it's effect, too!
This is great with cards like Mermail Abysslinde, any Hieratic monster, and XX-Saber Darksoul, since you trigger their effects as well. You can turn the tables around with this card so easily, I don't see why it's not at least Semi-Limited.
And if this is ever top-decked, you can always use it to negate an attack for a turn with it's first effect (similar to how Book of Moon works, except the monster stays face-up). You heard right, the only limitation this card has with its first effect is that you can't use it to flip a monster face-down, like Book of Moon.
I highly suggest you run this card whenever you can, because it's just so damn good.
-MorphGuy1000