Rakdos Gatemaster

When Rakdos Gatemaster enters the battlefield,
you get {e}{e}{e}{e}.
Whenever a Gate card enters the battlefield under
your control, search your library for an demon card,
put it into your hand, then shuffle your library, if
you got an demon card this way, you can cast it for {e}{e} instead of it's normal casting cost.
{b}{r}, {t}: search your library for a Gate card, put it
onto the battlefield tapped then shuffle your library.