Elios Kastra, the Exile

Whenever you play a card from exile, Elios
Kastra, the Exile explores. (Reveal the top card of
your library. Put that card into your hand if it's a
land. Otherwise, put a +1/+1 counter on this
creature, then put the card back on top or into your graveyard.)
{b}{w}{g}, {t}: Exile target creature or land card in
a graveyard. You may play that card for as long
as it remains exiled.