Mercurius
Legend
Theros has been out since June 2nd. People have been using it for weeks now. Just the physical book was delayed.
I know. Personal bias revealed - I don't like ebooks/pdfs/online stuff, except as supplementary, and don't consider them "full releases." At the least, consider my timeline above as "Theros release completed," or just ignore the "ID is announced" line and July 21, and it works.