Barad-dr The ability on Barad-dr isnt efficient, but its borderline free to slot into your mana base
MaRo himself has recognized at multiple occasions that Planeswalkers had some of the smallest design space of all the card types (except maybe lands?) Due to how inherently powerful their concept is, providing mana and card advantage, and the fact they all have multiple abilities, and so many other restrictions, it is no wonder that many designs converge towards somewhat similar end results
Given the number of cards youll draw in a long match with Zedruu the Greathearted, youll probably want to maximize your hand size there, too
And secondly, it can deal a massive burst of damage to all players when you do finally reanimate your lands, which could be game-winning if everyone's low on life
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