As long as Affinity exists, this is a one-mana Stone Rain / Doom Blade split card
While discarding a card is cool, the real reason this equipment gets played is all about untapping those lands
It only costs three ink to get out, has a strong will power stat of eight, gains you passive lore, and has a strong ability that Im sure Amber/Steel and Amber/Aggro decks are going to like
Their signature Blaster attack often has the ability to paralyze or stun your characters in some way, so a tapper is a good choice for its design
Decks that give you more coin counters with abilities like proliferate will definitely get more out of Wishing Well, but even other decks can use this card, and it is still viable in budget or more casual builds
Ballista loves a +1/+1 counter effect etc etc