382) Wolf den
384) Worker's village
386) Young witch
'X' and 'Z' are the only 2 letters keeping us from having a full-fledged "The ABCs of Dominion"*
Perhaps Dominion: Concerts will bring us Xylophone, while Dominion: StarCraft will bring us Zealot?
* "Full-fledged" because while we already had Action, Buy, and Cleanup... that's where it ended, as there was never a Draw phase