Shadowgrange Archfiend

The math on the body tells you what kind of demon this is: 8 power stapled to just 4 toughness, a stat line that trades durability for a fast clock and dares the table to spend removal it may not have. The enter trigger is an edict with a targeting quirk that matters more than it reads: opponents sacrifice the creature with the greatest power among what they control, so this eats the biggest threat rather than letting the defender chaff off a token. The lifegain scales to whatever it kills, which quietly answers the toughness problem: the same trigger that clears an opposing beater can refund the life you spent to get here early. That "early" is the second design lever. At seven mana this is a top-end body, but the madness cost reroutes it around the mana curve entirely: discard it (a loot, a rummage, a wheel) and it lands for three mana plus eight life, front-loading the edict-and-drain package well ahead of when a demon this size normally arrives. The 8-life payment is the honest counterweight, and it interacts precisely with the trigger it enables, since the drain from a large sacrifice can claw a chunk of that back the moment the creature resolves. What you get is a removal spell, a lifeswing, and a threat folded into one card, priced two different ways depending on whether it comes off the top of your library or out of your hand into the bin.