Just don't offer them pretending to sell some kind of ultra-rare misprint.
That could be Arcanis the Omnipotent to draw your deck or Merieke Ri Berit to destroy all your opponents creatures
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Arbor can fix a double off colour for you and it is an elf with power
The different leaders have different strategies, so one can focus on expensive spells and you can build a more control-oriented deck, while other leaders swarm the battlefield with smaller, cheap creatures that can give you an edge early in the game, and so on
X-damage burn spells like Choco-Comet are often worth playing on their own, regardless of additional upsides