But death triggers enter Magic as a kind of bargain
The fact that they have two hearts, acid saliva, and can steal peoples' memories by eating their brains, among other abilities, supports this idea
The second most expensive is Luffys Manga Rare (OP09-119) at 188,000
Skaff has joked that its his most important contribution to Magic
For the High Mana Value subtheme though, I count only 4 noncreature spells with high mv that you can cast for cheaper (e.g
Her impulse draw is only good in Mono Red decks and even so it notably whiffs on lands and artifacts, so realistically you only have a ~50-60% chance to get something out of it -- not great, hence why I suggest playing it with the intent of using her mana ability most often