After taking another look these are cards you'll miss the least IMHO: Rune-scarred Demon (this is a lot of mana for the effect in my experience, and it's better in decks that win via combos), Burning Rune Demon (same as the above, but I like this card a bit more because it's 1 less mana), Patriarch's Bidding (this can be unplayable some games depending on the opponent's deck, and unless I'm missing something you don't have self-mill to make the card better), Kardur Doomscourge (I like this card a lot, but if you need to make space he seems pretty low synergy, also plays poorly with Propaganda effects on an opponent's board), and maybe Rite of Replication (I really love this card, but I feel like it's usually too much mana to 'do the thing', I also feel like you have a decent number of Legendary stuff that can't be copied usefully, I could see this being a pet card)
Theres a better chance youll have what you need to play Chrome Mox in your hand because youll likely have more spells than lands in your deck
Their high demand and popularity's almost enough to sell a product on its own
What attacks does Grumpig have
Next, there are some rather unfortunate scenarios to consider
Its ability to reset a single opponent makes this an overwhelming powerhouse on multiple occasions
