The way Belbes ability is worded actually reminds me a lot of cards like Edric, Spymaster of Trest
I don't even think you would play this in an Amber/Amethyst deck as a Shift target for The Queen - Commanding Presence
Assuming we've entered the loop mentioned above, each time CarnageCarnage hits the board, we'll be able to recur that same creature we're losing during each combat step
I'll put it this way, if Q played in a Pro Tour, it would pull any un-set card it wanted into play on a whim and then be the judge that rules in it's own favor
Valgavoth is never depicted as literally warping the minds of his victims as Emrakul does, so Duskmourns delirium cards are tied to the traps and nightmares Valgavoth uses to torment those surviving in the House
various decks and strategies like Hammer, Hardened Scales or Blood Moon