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
Davros, Dalek Creator reminds me of Sygg, River Cutthroat, in that you want to deal 3 or more damage to obtain card advantage
Ajani, Caller of the Pride Ajani, Outland Chaperone Ashiok, Wicked Manipulator Chandra, Flameshaper Chandra, Spark Hunter Elspeth, Storm Slayer Jace Reawakened Kaito, Bane of Nightmares Kaito, Cunning Infiltrator Kaya, Spirits' Justice Liliana, Dreadhorde General Oko, Lorwyn Liege Oko, Shadowmoor Scion Oko, the Ringleader Professor Dellian Fel Quintorius Kand Ral Zarek, Guest Lecturer Ral, Crackling Wit Tezzeret, Cruel Captain The Aetherspark Ugin, Eye of the Storms Vivien Reid
The one I want to draw attention to, and probably the most useful non-wurm creature is Scryb Ranger
They are Quick Draw, Desert Bloom, Grand Larceny, and Most Wanted, all with different themes and color combinations to make each one feel unique