Normally, Dark Intimations can be a somewhat challenging card to maximize, as Grixis is not the color combination naturally getting a creature or planeswalker into the graveyard reliably by turn 5
The more niche you are as a card, the more you push toward the middle of rarity and away from the ends (common and mythic rare)
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From there, you'll want to combine card draw with 6-CMC spells to bounce any pesky planeswalkers, commanders or other nonland permanents that just have to be removed
But you can also consider any scalable X-cost creatures, moving Equipment around, throwing out combat tricks ahead of your trigger No effort is too great when its for the greater good of the coven