While the +1 is far less relevant in a deck that plays so few sorceries, being able to rebuild after a board wipe by returning your most powerful creatures back to your hand can give aggressive strategies additional reach
Notably, while the recent spike coincided with organic-looking demand for Taeko during the weekend of October 8 (NYCC), there were two sales spikes before that weekend that look like buyouts
Maleficent, Sorceress), while higher-cost (and rarity) options such as The Queen, Wicked and Vain and Magic Mirror provide strong, recurring mid-game draw support
The lowest recorded sale price is still a whopping $890
It needs to give you some immediate impact to make the Shifting valuable
Creature tutors are good in all Commander decks, but they are especially good in this one