Eladrin elves are known to be the most common to posess natural magic. Any communities of Eladrin are either joined with the elven capital or are native to the Fey Islands. Though not all are able to cast it at will, All are seemed gifted with a magical gift to keep them out of harms way, Fey step.
Most can learn how to harness their natural magic abilities.
In a sense all Eladrin are magical, But not all willingly weild it.
High in rarity and price.