Let us assume I use Behemoth's Herald's ability to search for a card named Godsire. If Godsire can be found in the library the situation is clear. But what if no Godsire is in the library and I have Godsire in my Hand? Can I still use Behemoth's Herald's ability to put Godsire onto the battlefield at no mana cost?
The official rules on searching (Comprehensive Rules, Section 701.17, Aether Revolt, January 20 2017) do not seem to answer this question. But I guess it is also relevant that the words "and" and "it" appear in the card's ruletext.