I use this site sometimes to find cards that are similar to one another. It’s automated so the comparisons don’t always fulfill the same role but it’s usefully different from lists that are curated by hand like https://www.mythicspoiler.com/. mtgassist.com has a similar feature but I prefer the results from Card Codex.
Compare the results from these two links
https://cardcodex.com/?card=Urborg%2C+Tomb+of+Yawgmoth#search
https://www.mtgassist.com/cards/From-the-Vault-Realms/Urborg-Tomb-of-Yawgmoth/
This is awesome, thanks for the share. I just used this to find Reckless Impulse, I remembered Wrenn’s Resolve but couldn’t remember the earlier one! Will be using this for sure down the line.
Curiously, as another test [[Thran Dynamo]] pulls up [[Ancient Den]] first and then [[Azorius Signet]]. I would’ve expected [[Worn Powerstone]] and similar straight up colorless rocks first. It’s even worse at MTGAssist though, which shows [[Geode Golem]] (??), [[Sol Grail]], and [[Honor-Worn Shaku]] (???) first.
The model certainly has some obvious flaws like you noticed with Dynamo and Powerstone. I don’t think it “counts” words or symbols on cards and it definitely doesn’t have a notion of the “role” a card might play in a deck other than its key words.
I like using it when I have a card that has a niche intersection of mechanics/words and I want to find all the cards that are as similar as possible without manually searching every possible subset of those mechanics or words.