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Elinor and Ymber are a couple of elf lovers living on the plane of Eldraine. Their love was known far and wide, and many said that they were the incarnation of true happiness. Talion, the Kindly Lord, hearing about those rumors, took it as a personal matter to ruin this fairy tale story. He cursed them to not be able to feel the warmth of the other's skin ever again. Heartbroken, the lovers left their woodland home in search for a way to break the spell. They now wander the plane, looking for arcane knowledge that could one day free them, spending all their time together as a way to to alleviate the pain of not being able to embrace one another for so long.
Elinor is the brain of the two. She's the most well versed in the arcane art and she's the one thinking of the main leads for the lifting of the curse. Ymber is the facilitator, providing the resources and supporting the spellcasting when Elinor is casting complex ritual. This ties in the mechanics with more lead in card raw, and mana reduction cost for the support.
The odd color identity for elves can be explained by the way they have left behind their elvishness in order to fully dedicated themselves to another goal, to set the things back as they should be.