Ive used it to cast things as innocuous as Cultivate all the way up to exiling a Surge to Victory and exiling my Ephemerate while I had Aurelia, the Warleader in play (spoilers: thats a combo)
Instead, the games designer and creator, Richard Garfield, loved the mock up so much that he just used that
If we just look at unique card names from Alpha to the advent of foils, that gives us 3,075
Mast has seen cards go for "upwards of even seven figures," he said
Notably, every time the Ring tempts the player, that player may choose a new creature to become the ringbearer (if they wish), which is a good idea if the original ringbearer starts struggling to push damage, or if the player resolves a better creature spell later