Gyler, Obsessive Tinkerer

When Gyler, Outcast Tinkerer enters the battlefield, exile the top two cards of your library.
You may play artifact cards you own in exile.
{2}{t}: Exile an artifact card in your hand,
graveyard, or on your battlefield: exile the top
card of your library. the next artifact spell you
cast from exile this turn costs {2} less to cast.