According to known Pokemon leaker Centro Leaks, trading the card-collecting mobile hit will be limited "to diamond and 1-star cards:" "Seems like Pyoro is now hinting at the 'Pokemon TCG Pocket' trading feature being limited to diamond and 1-star cards." Pokemon TCG Pocket doles out its cards on an eight-level rarity scale, going from Single Diamond (aka common) up to Crown Rares (ultra-exclusive gold art cards)
Perhaps not precisely, but there is a parallel
It is quite different from the list we initially presented, but it carries the same initial idea
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Iymrith, Desert Doom: If a spell or ability an opponent controls targets Iymrith, Desert Doom while it is tapped, finding a way to untap it in response will not cause its ward ability to trigger
Star symbols come in various colors including the commonly seen black stars
You may reveal an artifact card from among them and put it into your hand