Sinistea is card #SV052 of 122 in Shining Fates Shiny Vault (2021), a Rare Shiny illustrated by Mahou. At about $4.37 it is the #34 most valuable card in the set. It is one of 5 Sinistea cards printed so far.
1 copy has been graded by players in Holobrook's grading game. None has come back a 10 yet.
POP 1 is still open for PSA, BGS and CGC: the first player to grade this card a 10 with each company gets a one-of-a-kind POP 1 slab. See the Mint


















See the full Shining Fates Shiny Vault card list
An ungraded Sinistea from Shining Fates Shiny Vault sells for about $4.37. A PSA 10 is worth more, roughly $15.29 by our estimate, and a PSA 9 around $8.74.
It is a Rare Shiny.
Mahou drew the art for this card.