Diagon Alley

At the beginning of your upkeep, if you
control three or more Students and/or
Teachers, you gain 2 life.
{t}: Add {1}.
{4}, {t}, Sacrifice Diagon Alley: Search your
library for an artifact card, reveal it, put it into
your hand, then shuffle your library. Activate
this ability only if you control three or more
Students and/or Teachers.