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It depends on what you have, how fast you need the money, and how much effort you want to put in

Soul Spike Soul Spike looks pretty inefficient at first glance, but it can be a pretty nice combo piece in decks that utilize Necropotence or Necrodominance

These promos will also be more widely touted as a source of flavor and worldbuilding, allowing talented artists (or art directors) to define a chunk of the worlds visual flavor without restrictions

Play a utility creature

Id recommend reading the following in particular: Fan favorite Pokmon/historically popular Pokmon Cards that are hard to obtain e.g

Rydia, Summoner of Mist lets you find new cards and recur Saga creatures, while Gladiolus Amicitia hits hard turn after turn