Yes, Edgar's first ability will trigger when you cast a Vampire spell from the top of your library with Bolas's Citadel (assuming you control Edgar on the battlefield or own Edgar in the command zone [C.R. 109.5, 113.6b, 603.4]). (Note that Bolas's Citadel now says "You may play lands and cast spells from the top of your library" [C.R. 108.1]. See also this thread and this thread.)
It always has been able to play lands. The updated wording only makes it clearer.
N.B. You still can play only one land per turn, and still must obey sorcery/instant timing restrictions.
Kind Regards
It always has been able to play lands. The updated wording only makes it clearer.
N.B. You still can play only one land per turn, and still must obey sorcery/instant timing restrictions.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules