I'm just wondering exactly how Sphere of Sapience interacts with targetted draw. Say I drop a fireball to the bottom of the deck via sphere, followed by an ice barrier to the bottom, and then play Inconspicuous Rider. Is the deck then shuffled? Does the fireball stay bottom? Does this somehow change if there's one/two barriers? If there's two, which is pulled by Rider, or is it random if it's still bottom? I'd presume that taelan would work the exact same as rider here.
Tutors do not care about the order of your deck, just if there is a card or not. If several cards match the tutor criteria, it chooses randomly.
I am not entirely sure about the meaning of "bottom" in this case, and which cards reshuffle. I am pretty sure swapping decks does reshuffle, though.
Edit: I did some testing. Direhorn Hatchling says "shuffle into your deck", and that means that the cards Sphere of Sapience put at the bottom will not be at the bottom anymore. I assume this is the case for all "shuffle" cards, including your opponent's deck and orders made by Lorekeeper Polkelt.