There's no one-size-fits-all answer here
As a fan of the TCG himself, Zeller says he sometimes let fans squeak by with extra product during the early days of quarantine, but says hes tightened up since then
In other words, if a creature has flying, it can only be blocked by another creature with flying
Like most Magic: The Gathering cards, the value of Demonic Counsel depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Duskmourn: House of Horror)
Its hard to beat some kiddie pool shenanigans, but my favorite by far was just the alternate card art for this big dumb Gulpin
Thats a lot of gameplay to get into one card, but it just goes to show you how deeply this collection understands both parts of its collaboration