Personally, I have a lot of faith in the card and try to use it very judiciously, and I dont mind letting another player get ahead early to draw the ire of the table
If you buy the Modern Masters version you dont even deserve to play Jund

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Whats your favorite self-mill deck
6 Jace, Wielder of Mysteries War of the Spark introduced static abilities on Planeswalker cards, which made Jace, Wielder of Mysteries an alternative win condition for some decks
There arent enough playable sagas in these colors, and Izzet legendaries as a strategy isnt very well supported either