Landscapes - these play so much more cleanly than the Capenna cycle, don't have incidental life gain, and aren't dead late game draws. Easy swap.

Ritual of the Machine - Love this card, but there are just not enough valid targets in this cube for it to play very well. Need to build another cube where it can shine.

Golgari Thug - dredge doesn't need the help. Molten Gatekeeper slots in so well to several different decks.

Pitiless Carnage - I don't know why I ever thought this card might be good in this cube. Without tokens, this thing goes from deeply mediocre to absolutely terrible.

More swaps to come as I get the cards.