Think Furnace ReinsFurnace Reins, Act of TreasonAct of Treason, and Song-Mad TreacherySong-Mad Treachery - which doesn't even cost you a nonland slot
I personally think that the deck was intentionally set to two colors to both align with the popular new character, Saheeli Rai, and to make sure it felt meaningfully different from the four-color artifact deck from Commander 2016
The upcoming Final Fantasy crossover is another good example of this creativity
In order to play a card or an ability, you must sacrifice a land that produces at least one colored mana of the card you're playing
It can be enabled and repeated triggers are only a Freed from the Real away
(You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.) Instant Color tag templates(None) Arcane Subtraction Target creature gets -4/-0 until end of turn