Invasion of Ravnica ($23) A cute trick of a card, this is incredibly niche
Regulation Marks & Set Codes What the Letters Mean Every Japanese Pokemon card from the Sword & Shield era onward has a small letter in the bottom-left corner this is the regulation mark
Now, all of a sudden, all the Clues you pile up aren't just future card advantage, but they're now also extra Artifacts that can be tapped, sacrificed, or otherwise turned into mana and value, which makes the whole engine feel a lot more explosive than it first appears
It mostly shines in dinosaur decks and out of the sideboard against blue decks
Not to mention, with Naveens Its Beautiful No
Then you make two 1/1 flying dorks afterwords, so it's Kirtar's Wrath with threshold, only everyone can slowly over time recast their things if they weren't tokens