Activate 1 of these effects.● Target 1 face-up monster your opponent controls; change that target's battle position.● Tribute 1 monster, then target 1 face-up monster your opponent controls; take control of that target until the End Phase.
I watched the replay of one player’s match on reddit yesterday and he almost lost the game against Subterrors, then he used this card to take the opponent’s monster under his control and kill him in one turn.
All tier 1 decks use this while they can.
And most nerfs were just so that they could not use it anymore (E-con in Vampire decks for example).
only giving up a card. um, what?? you give up life points every turn using archfiend cards but 800/1000 life point cost was too much for a powerful spell card like enemy controller? but you have to pay 1000 life points just to "look" at someone else's cards (seal of the ancients)?