Rain of Filth Rain of Filth is a mana doubler that comes at a bit of a cost, but you're in black so you'll take power at any cost
Specifically it's due to one of the most popular MTG commanders from the set: Vivi Ornitier
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Instead, Diviners Wand finds itself in decks that care about cost reduction on activated abilities, since its easy to turn the ability into : Draw a card with the likes of Agatha of the Vile Cauldron
On the other hand, a high cmc deck that wants to win on turns 10+ will want a higher land count so you can consistently hit your land drops on turns 5+
Of course, not losing once is ultimately just another form of lifegain and isnt really worth a four-mana investment, but the way the card reads gives it a wow factor that will make people want to play it