Charm

A Charm is a modal instant spell with three possible results of which one can be selected. Charms usually appear in horizontal cycles. So far there have been charms at common that cost a single colored mana, charms at uncommon that cost three different colored mana centered around one color with its two allies and charm at uncommon costing two colored mana. According to Mark Rosewater in 2014, players like these Charms and he was pretty sure they would see them again (knowing that would appear in Khans of Tarkir).

The term "Charm" came from the Mirage design team, referencing a fantasy term for a small object with tiny amounts of magic. The name has become a staple for this type of effect, but the names now imply a small magical effect rather than a magical object.

The card from Throne of Eldraine, a creature with a modal enters-the-battlefield ability, is a nod to the charms.

Other charms

 * Warping Wail (Oath of the Gatewatch)