The real question is how big are the drawbacks of needing a guy to play it on and having that guy killed or blocked
Oathsworn Vampire and Feast of the Fallen are probably the two best examples of this, and they both rely on Innistrads worldbuilding to be successful
Vaporeon might not be the most valuable Eeveelution from the set, but it surpasses a few others, including its Kantonian peers in Jolteon and Flareon
You may have to reluctantly run it if your Deck has no built-in way of outing Chaos Hunter and can actually afford to Summon this and discard 1 and get it off the field after
When a card is produced in limited quantities, whether as part of a promotional event or a special set, it automatically becomes more sought after
Im generally not a fan of edicts in Modern given the number of small creatures running around, but Riveteers Charm solves that nicely by always getting the opponents biggest thing