Within the limits you already calculated you should really try to make a viable deck that works without the demon.
Otherwise you'll have a lot of losses on your hand before it goes off in a game.
I tend to overcompensate in this regard, though. My wizard deck recently won on Chandra's Ignition and Kozilek, the Great Distortion whom I had added for late game card draw. And my 5-color superfriends deck won on the supporting cast of two Sliver Queens and her motley crew of ability granting minions...
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In magic there's Harry Dresden, Fizban, Sethra Lavode, Dorotea Senjak and me...
My meta: 3 or 4 player free for all, anything goes but boring games or broken decks cause a vote to end that game.
Teferi's Protection, Burst of Speed, Hellcarver Demon.
(Or something smart with Teferi's Realm and extra upkeeps?)
In short, you could build a fun deck and run the demon as a trick in stead of the core.
Anyway, if you don't wanna, you don't wanna. But I think there are ways...
My meta: 3 or 4 player free for all, anything goes but boring games or broken decks cause a vote to end that game.
Otherwise you'll have a lot of losses on your hand before it goes off in a game.
I tend to overcompensate in this regard, though. My wizard deck recently won on Chandra's Ignition and Kozilek, the Great Distortion whom I had added for late game card draw. And my 5-color superfriends deck won on the supporting cast of two Sliver Queens and her motley crew of ability granting minions...
My meta: 3 or 4 player free for all, anything goes but boring games or broken decks cause a vote to end that game.
Would you run slow-blink effects to save some stuff?
How about effects that trigger on sacrifice or dying?
Mass reanimation and haste? (Ogre Battledriver maybe)
That way you get profit not only from the good effect of the demon but also from it's drawbacks.
My meta: 3 or 4 player free for all, anything goes but boring games or broken decks cause a vote to end that game.