Talrand, Sky Summoner is great mono blue commander, combining two blues primary mechanics: spell slinging and flying creatures. Casting multiple instants with Talrand is great way to create an army of fliers during opponents end step and then retaliate during your own combat phase.
Cantrips are spells with a draw effect on them. Cantrip decks are often instant and sorcery spell slinger decks and aim to cast as many cantrips as possible and creating value from the cast triggers.
Spell slinging is an archetype for decks, focusing heavily on instants and sorceries. Wincons can be anything from tokens, to removals and counter spells to storm and burn effects.