You may remove the top three black cards in your graveyard from the game rather than pay Spinning Darkness's mana cost.
Spinning Darkness deals 3 damage to target nonblack creature. You gain 3 life.
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Spinning Darkness Discussion
3 months ago
As far as suggestions go, I can't help but feel that your land count is a bit low - I tend to stay around the 37 mark. I noticed that you're a bit sparse on draw spells, and black gets some of the best draw pauper has to offer; I run Sign in Blood, Night's Whisper, Succumb to Temptation, Phyrexian Rager, and Read the Bones in my own list.
Three cards in your list that seem a bit underwhelming to me are Last Caress, Contaminated Bond, and Reave Soul. The former seems too minor an effect, even with the cantrip. The Bond is a cool card, but most of the time I think it's a better idea to remove the threat entirely (if you dig the "slow drain" theme, I think the Contaminated Ground in your maybeboard would be better in this slot.) For myself, the sorcery speed of Reave Soul makes it less appealing - maybe something like Wring Flesh, Spinning Darkness, or Tendrils of Corruption would be worth considering? I also dig Viper's Kiss as "utility" removal.
Great deck, though! Pauper EDH is my new favorite format, as it tends to feel more like 'oldschool' magic.