We will present our answer to a few narrower versions of the question above
Absorb is a wonderful second Counterspell for traditional white-blue-style control decks, giving them two things they want and nothing they don't
There are tons of cards that care about sacrifice effects and fetch lands give you another card to sacrifice Pay 1 Life Similar to sacrifice, there are many cards, and even entire deck strategies that care about you have a low life total
Notably, her first ability allows her to draw a card on other players' turns while also potentially dealing damage on other players' turns if she casts a spell outside of her own turn
Like Flynn Rider, Charming Rogue above, Cheshire Cat, Not All There is an excellent emerald card to get out early in the game to disrupt your opponents, forcing them into dilemmas that slow them down and ruin their plans