I am going to start with the worst planeswalker ultimates however for this list I have been rather selective and only chosen to consider planeswalkers than are at least playable, ideally good, in cube
Can enchantment-creature tribal work
Its use of vibrant neon colors helps each element of the card pop, and the environmental elements like the purple and green magical smoke, or the gleaming gold of the dead legionnaires equipment are beautifully textured
Crescent Island Temple Go-Shintai of Ancient Wars Go-Shintai of Boundless Vigor Go-Shintai of Hidden Cruelty Go-Shintai of Life's Origin Go-Shintai of Lost Wisdom Go-Shintai of Shared Purpose Honden of Cleansing Fire Honden of Infinite Rage Honden of Life's Web Honden of Night's Reach Honden of Seeing Winds Kyoshi Island Plaza Northern Air Temple Sanctum of All Sanctum of Calm Waters Sanctum of Fruitful Harvest Sanctum of Shattered Heights Sanctum of Stone Fangs Sanctum of Tranquil Light Southern Air Temple The Spirit Oasis
The three runners-up to the top spot are VII, X, and VI
There just arent as many viable ramp options, even with Treasure tokens seeing increased support, which makes it incredibly difficult to access additional mana beyond your land drop each turn without mana rocks