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At the beginning of your end step, if you've cast a noncreature spell this turn, reveal the top five cards of your library. For each card type among noncreature spells you've cast this turn, you may put a card of that type from among the revealed cards into your hand. Put the rest on the bottom of your library in a random order.
Hurkyl need not have been on the battlefield at the time the noncreature spells were cast for the ability to trigger or for the spells to be counted.
The card types that a noncreature spell can have are artifact, enchantment, instant, planeswalker, sorcery, and tribal. Subtypes, like Human and Equipment, and supertypes, like snow and legendary, aren't card types.
