I've put together a cube featuring only cards using the old style card frame and I'm trying to prepare for odd interactions that may occur. If you activate a Ghitu Encampment then activate Zelyon Sword to give it +2/+0 will it continue to receive the bonus if you activate Ghitu Encampment on another turn assuming you don't untap the sword during your untap step?
Yes, Ghitu Encampment will continue to get +2/+0 "for as long as Zelyon Sword remains tapped", even if Ghitu Encampment stops and resumes being a creature in the meantime (C.R. 611.2a). (Note, however, that Ghitu Encampment will have power and toughness only while it's a creature [C.R. 208.3].) See also this thread, this thread, and this thread.
Zelyon Sword + manland?