Yuriko, Blade of the Mighty is missing a UI/UX element to properly communicate when you can't cast a spell or activate an ability due to her first ability. Under most circumstances, when you try to perform an action and a permanent on the battlefield is preventing you from being able to take that action, there's a red glow and sound effect around that permanent to draw attention to it. This is missing for Yuriko. I lost a game and an entire draft ended because with 20 creatures on the board, I took extra damage over the span of four turns because I couldn't figure out what was going wrong with my spells.