HTML, Protogen Researcher

When HTML, Protogen Researcher or another Protogen enters the battlefield, you may pay {b} or {g}. If you paid {b}, return target non-Legendary creature from your graveyard to your hand. If you paid {g}, look at the top 5 cards of your library, you may reveal a non-Legendary creature from among them and put it into your hand, return the rest to the bottom of your library in any order.