Spirits are a creature type strongly associated with white and blue, flying, flash, and disruptive abilities. Spirit decks often play like tempo decks, developing evasive threats while interfering with opposing spells and removal.
Mausoleum Wanderer can sacrifice itself to tax an instant or sorcery, while Spell Queller temporarily exiles opposing spells. Katilda, Dawnhart Martyr takes Spirits in a more enchantment-heavy direction.