Esly, The Storyteller

When Esly enters the battlefield, exile the
top card of your library. If it is a land you
may cast it from exile. If it is a creature, you
may cast it from exile for {3}{g}. If it is an
enchantment, you may cast it from exile for
{2}{g}. If it is an instant or sorcery, you may
cast it from exile for {1}{g}.