Darksteel Citadel has lost some charm with the printing of Modern Horizon 2 s indestructible artifact dual lands
Take a rough sketch (budget, power level, theme, playgroup) and use tools like Scryfall to filter 2,000+ legends down to candidates
While I guess you could try to flip it into a 3/4, and that might be the right line in some situations, I think there would be decks (at least in Standard) that would play the front side as a sorcery
The most powerful cards in the deck tend to be expensive to play, and it's not easy to draw the exact cards you need
One interesting thing to do in 1v1 formats is to use this to turn all of your creatures into Wastelands
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