Reveal a card from your hand. Search your library for a card with the same name as that card, reveal it, put it into your hand, then shuffle your library.
Hellbent — If you have no cards in hand, instead search your library for a card, put it into your hand, then shuffle your library.
We’ve talked about how it’s important to hold priority when casting this card and using Lion’s Eye Diamond in response, but I can’t stress it enough! It’s also crucial to remember that you can cast it for a secondary copy of something in your hand. I’ve watched other Storm pilots completely blank on this in the middle of a game with tunnel vision.
When I’m revealing a card to Infernal Tutor, it’s usually some sort of mana or protection spell. Sometimes, it’s just to shuffle my deck after a Brainstorm or a Ponder.