There are no inherent benefits to having two specific colors in a deck outside of those colors' commonly used gimmicks - so Inking more cards for Sapphire, drawing more cards for Amethyst, having more Singer characters for Amber, and so on
Black appreciates this effect more, particularly since white always has such an abundance of stuff along these lines (while black rarely gets anything remotely this good at this)
Be sure to pack all the supplies you will need during this trip to Ravnica
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Likewise, the Mythic Rare card, The Deck of Many Things, can literally win you the game if you hit that magical 20 in a d20 roll
Neyali, Suns Vanguard Now heres a card that punishes your opponents if they let you go wide