Few planeswalkers apply this much pressure this early for so little mana, which makes her efficient disruption hard to ignore
Regarding that, I see how the plot cost compares to the casting cost of a card as a significant factor in how these cards play and should be played
So that includes other utility lands, utility artifacts like Chalice of the Void and Tormod's Crypt, X-cost spells like Endless One, 0-cost spells like Pact of Negation, and even no-mana suspend spells like Glimpse of Tomorrow
Evolution to work around an item lock and keep up with the opponent
They can be solved fairly easily, and, unless combined with the other half of their combos (proliferation of counters, Mycosynth Lattice, Wheel of Fortune), dont have a huge impact on the game for more than a couple of turns