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NOTE: Set by owner when deck was made.
With the amount of instant and sorcery spells in the deck i think Dark Petition would be better, especially if you are floating at 6 mana, you could get a Triskaedephobia and cast it on the same turn if Spell mastery is procc'ed
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Dark Petition is a good card and worth considering here. If you stick with Mastermind's Acquisition, I recommend moving 1 Tree of Perdition and 1 Triskaidekaphobia to sideboard to protect the main deck from exile effect like Surgical Extraction or Lost Legacy.Other card suggestions I have:> Victim of Night - Death's Shadow is a big threat in the format and Doom Blade can't touch it. I would suggest Go for the Throat in Doom Blade's slot, but Affinity / Robots is a thing too. Victim of Night hits a lot more im the format than the other two do. Grasp of Darkness and Dismember are more decent options. > Godless Shrine - This can replace a few of the basic Plains and opens up Verdant Catacombs / Bloodstained Mire / Polluted Delta to replace Evolving Wilds. The option of coming in untapped is a big advantage. > Damnation - Go wide / untargetable creature strategies will be a problem. This or Wrath of God or Day of Judgement will go a long way in keeping you alive long enough to combo off, with Damnation being the best as you're currently heavily skewed to black. Dusk (Dusk // Dawn) and Languish are options that keep Tree of Perdition alive while wrathing.