This is a good card, but one that requires being used in a specially-prepared deck - preferably a deck loaded with sorcery and instant cards for dealing damage, as opposed to lots of creatures
In general, the deck is looking to survive the first few turns by stopping others win attempts, then grind value with creatures or powerful enchantments like NecropotenceNecropotence until it's acquired enough mana and cards to go for a win, often at instant speed
If White Auracite leaves the battlefield before its triggered ability resolves, the target permanent won't be exiled
Ugin, Eye of the Storms (Showcase) - $76.69 I own a non-Showcase version of Ugin, Eye of the Storms , and its a ridiculously fun Planeswalker for colorless decks owing to its ability to add three colorless mana at no cost
Different versions Black White control and Izzet Wizards was what I was trying out