Dear ktom-
This came up on agotcards.org here. Need a rules lawyer on this one:
What happens I play Enslaved on Reek, and then I try to trigger Reek's ability?
There are two legitimate, and two not-so-legitimate, interpretations in my mind.
1) Enslaved is a constant effect, so since Reek is not able to pass control, his effect is not able to be triggered.
2) Enslaved is a passive with the point of initiation being playing the card. According to the FAQ then, if another effect caused Reek to pass control, Enslaved would still be attached but the duration of the effect would end (since it's permanent until control passes again), rendering it essentially useless.
3) Enslaved is a constant effect, so you can trigger Reek but then the effect immediately kicks back in and Reek would remain under your control. (This seems less logical since passing control would essentially be creating an illegal gamestate if it is indeed constant.)
4) Enslave is a passive effect that constantly checks its condition. So it would essentially be the same as #3 without creating an illegal game state, except it would resolve as a passive when the response is triggered. However, this is assuming that it's a passive with the ability to constantly trigger, and it's not clear that there is a real point of initiation for the effect other than actually playing the card.
I don't know. What do you think, sir?