This is one of the best signature events in the game, and is not even close, only Bury Them Deep can even compare. Just being able to search your whole deck for an action for any spell or item you want in one action for free is incredible, being able to immediately play it with a cost reduction without worrying about enemies is even better.
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Need to Investigate? This can get you Second Sight, Eyes of the Dreamer, Eye of Chaos Sixth Sense, Clairvoyance, or Rite of Seeking immediately and reduce their cost to a manageable amount
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There is an enemy on top of you? Fetch Shrivelling , Wither, Azure Flame. Armageddon, Breath of the Sleeper, Mists of R'lyeh, Ineffable Truth, Shroud of Shadows, Shadowmeld, Suggestion, Blur or whatever else you are running
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Have all the spells you need? You can still use it to find hand items like Scroll of Prophecies, Ceremonial Sickle, Onyx Pentacle, Dowsing Rod, Enchanted Blade or Sword Cane or accessories like Holy Rosary, Bloodstone or Crystal Pendulum
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Somehow have NOTHING left to search for? Just commit it! It has fantastic icons new Dexter very much cares about!
This a fantastic card for its own effect, but there yet again something else fantastic about it: its traits!
It's a Trick and Spell: now, being a Trick doesn't do much beside having synergy with Chuck Fergus, but being a Spell opens it up to a lot of combo pieces you were probably gonna run in the first place. I was planning myself to build around Speak to the Dead to resuse, but as Tharzax pointed out in the comments, that is only the tip of th iceberg: you can also fetch it with Arcane Initiate, sacrifice health to shuffle it into your deck wtih Ritual Dagger or get multipe uses of it with Dayana Esperence!
Overall, this is just a fantastic event in every single way, with not only only a great effect, but also a lot of synergy with Mystic tools: a worthy successor to Molly Maxwell and something that blows Showmanship out of the water!