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Perhaps earth ponies can use magic. But they need various provisions such as artifact, magic circles, potions, elixirs, formulas etc in order to do so. While for unicorns, it is inherent that they can just invoke magic with their horns.
Pomegranates :P
Also, Somnambula’s not a unicorn, so how did she create that one spell mentioned in the season 6 premiere? Unless there’s more than one Somnambula in FiM’s universe (it’s definitely possible)…Also Meadowbrook, who is an earth pony, was apparently a mage.You know what would be interesting? If it turned out that back when the three tribes were separate, both the pegasi and earth ponies had their own unique branches of magic, with unique spells, teaching methods and whatnot. Then, after the unification, the unicorn magic became the dominant one because it was more versatile/powerful/easier, so the other two became more rare and sorta died out. It would explain so much about the current Equestria.
Perhaps earth ponies can use magic. But they need various provisions such as artifact, magic circles, potions, elixirs, formulas etc in order to do so. While for unicorns, it is inherent that they can just invoke magic with their horns.