Horizontal miscuts tend to be far rarer than vertical ones, and seeing a name of one card on the artwork of another tends to be a sweet spot that is ideal for most collectors
A price that seems too good to be true usually is
When it was on a creature, they would give it "Legend" as a creature type, but for other types of permanent they put it before the type, such as "Legendary Land" or "Legendary Artifact"
If the adorable artwork on a Pokmon card is more important than market value, check out some of the cutest Pokmon trading cards ever made
If Merfolk is a successful Standard deck, it will be in large part due to this card, but even if it isnt, there are plenty of other homes for Herald of Secret Streams
Bouncing your Moxen isnt an issue, since you can just replay them right after