Miso, Transcendent Collector

While you control three or more artifacts, Miso is
not a creature and gains "{t}: Add {u}{u} to your
mana pool. This cannot be used to cast creature or
enchantment spells.".

{2}: Scry 1 then exile the top card of your library.
Artifacts exiled this way may be cast from exile until
Miso leaves the battlefield.