That means they either include some combination of black and/or white in their mana costs, or have black/white symbols represented in their rules text somewhere
In Modern and Legacy, its great against the Dragons Rage Channeler/Murktide Regent decks, while in Vintage its a maindeckable hate-card against Bazaar of Baghdad decks
Synonymous with control strategies, the blue and white color pairing of Azorius has long been a staple of nearly every format of Magic: The Gathering
Shaun, Father of Synths Shaun, Father of Synths puts a flashy spin on legendary combat by turning your attackers into temporary clones
Bolass Citadel Bolas's Citadel isnt a particularly fair or balanced card, and it really preys on the higher life totals in Commander
Then reveal cards from the top of your library until you reveal X land cards, where X is the number of legendary creatures you control