It's so much more than an overpriced tutor, because a turn-two Starfield ShepherdStarfield Shepherd can grant you either the land drop you need or a nice one-drop that can impact the board right away, like Esper SentinelEsper Sentinel or MockingbirdMockingbird
Duress your Timetwister
Countermagic : Mystic Snake, Frilled Mystic, Draining Whelk Reanimation : Karmic Guide, Phyrexian Delver, Extraction Specialist Milling : Manic Scribe, Thieves' Guild Enforcer, Sage's Row Denizen Self-Milling : Stitcher's Supplier, Satyr Wayfinder, Balustrade Spy Discard : Burglar Rat, Mesmeric Fiend, Sin Collector Goading : Insufferable Balladeer, Jeering Homunculus, Vengeful Ancestor "Gain Control" effects : Hostage Taker, Agent of Treachery, Gonti, Lord of Luxury Clones : virtually all of them, though a few are decently pricey
If you're building a deck for a Constructed format like Standard or Modern, you need a 60-card deck