There are relatively few expensive spells that paying 4 to return one to the hand is not amazing most of the time as well although stopping something like a Titan from getting its come into play effect can be pretty huge
While taking infinite turns is the obvious one, there have been infinite damage combos with this card as well over the years
Those were the two things that needed to happen for this to take off, which explains why this was one of the only rares in Theros to gain on its preorder price
Lyra Dawnbringer You may remember that I praised the reprint that this card received in Jumpstart 2022
Punishing your opponents' card draw makes this a lovely addition to black lifegain decks
You could ask: Are you going to attack me this turn? Do you have a counterspell in your hand? Are you able to win the game this turn? If I were to ask you if you concede the game, would your answer to that question be the same as the answer to this question? Spark Fiend is hilarious because its not entirely clear what the card does, why it does it, or how it does it