After eliminating Sifa Grent, the Planeswalker that destroyed his hometown, Dack has settled down in Ravnica to do what he does best: break in and steal the secrets from Ravnica's rarest artifacts

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)
These cards are good in certain versions of the deck, but ultimately not what were trying to do
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Very No Country For Old Pokmon, that