Both of them share the characteristic of their ears or horns standing out, and both give off a bit of a spooky impression, so I felt it would be a good idea to place them in front of a moonlit night sky
This is probably comparable to The Great Henge from Throne of Eldraine and so could easily be a $15-20 card in the not-so-distant-future (for reference, The Great Henge is currently $23 on TCG)
You need some big payoff card for being mono-color, a big tempo payoff for having untapped perfect mana, or you need the mana in the format to be unreliable for two-color decks
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Black has powerful planeswalkers that generate a resource advantage and the ability to trade cards for life, which are traits that midrange decks appreciate very much
Since drawing happens before discarding, you will have at least one card to discard after the draw portion of connive resolves