Gold Crown Poké Ball ?!

Yesterday in a ranked match, a player drew this rare card I had no clue even existed. Does anyone knows anything about it? Very little about it is available online beyond just confirming that it exists (picture)... What packs? What extension?

[edit]: It looks like it's actually the only Crown card from A2b, with a pull rate similar to Arceus EX gold (0.004%) !!