On just those base attributes we have Cruise starting off as three times better than Dig, instant speed and card quality don't come close to making up that difference in a deck like RDW
Hydroid Krasis Hydroid Krasis is one of the best ways to spend your mana in ramp decks and a card that was a staple across multiple formats
That means that you can get double from all sorts of things
On the other hand, if youre like me and mostly play digitally these days, with no plans to return to in-person events, selling off your physical cards can be a smart move too
Even outside of that, Culling Ritual is a great tool to get rid of common mana rocks, draw engines like Mystic Remora, as well as any other powerful cards that come into play quickly
Urabrask the Hidden is a favorite of mine, and Anger is also great if you build around it (also much easier when adding black to your deck)