Its a villain, it soft ramps, and the stats are high enough that it can cause some havoc

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Land Tax helps prevent white decks from falling too far behind, especially since white generally lacks effective ways to boost its mana
Floodborn characters born from the game fictional concept of a "cataclysmic ink flood": an event unleashed when a forbidden book was opened, changing heroes and villains alike into more powerful forms, though many magical "pieces of lore" were lost in the ink flood as well
Fellwar Stone and Relic of Sauron round out the group
In short, it's all about patience in the late stage