Dalaran

Dalaran enters the battlefield tapped unless you control a Island.
{t}: Add {u}.
Instant and sorcery spells you cast cost {1} less to
cast.
Dalaran was the home of an incredibly large library
of books and tomes, in addition to many of the
greatest sorcerers of the day including Antonidas,
Khadgar, Jaina Proudmoore and Kel'Thuzad.