It gives a player a way to put cards from their graveyard back into their deck, possibly recovering important cards, and then lets them draw a new hand of seven fresh ones, perfect for if one has more mana than useful cards prior to playing Timetwister
The trickiest part about getting a card graded is that even if the card goes directly from pack to grader, there can still be errors that are out of the owner's control that occurred during printing
To this day, Demonic is one of the best tutors in the game and a deserving namesake for the mechanic overall
Ayula, some bears, and some spells dish out +1/+1 counters, and given that bears tend to be 2/2s, it needs all the anthems and power buffing it can get
My guess is for Marisi, Breaker of the Coil, but he's gone, so no need to keep it
Control decks typically want the game to go on longer so that their bigger cards end up having more value