4 Stained-Glass Plains, By Magali Villeneuve Stained-glass was a running theme in Dominaria United, apt for a set focused on history and legendary characters above all else
Not just because of the archetypal significance, but because casting this for double blue or double white in any other color combination sounds completely untenable
Whether you want to protect your own win condition, or stop your opponent from resolving theirs, both of these cards can swing a game in your favor without you needing to hold up any mana
Pair it with Treasure engines like Kalain, Reclusive Painter or Prosper, Tome-Bound, and suddenly your plays become unstoppable, keeping opponents from interacting while you push damage
Why arent you
Whether because of a rules nonbo or just lacking the legendary supertype, not every build-around is eligible to take command