Tranquill is card #124 of 149 in Boundaries Crossed (2012), a Uncommon illustrated by Kanako Eo. At about $2.08 it is the #101 most valuable card in the set. In a Boundaries Crossed booster it turns up about once every 13 packs. It is one of 10 Tranquill cards printed so far.
2011Black & White
2012Boundaries Crossed
2015Roaring Skies
2019Unified Minds
2020Rebel Clash
2022Pokémon GO
2024Temporal Forces
2025Black Bolt

















See the full Boundaries Crossed card list
An ungraded Tranquill from Boundaries Crossed sells for about $2.08. A PSA 10 is worth more, roughly $16.64 by our estimate, and a PSA 9 around $5.82.
It is a Uncommon, and it shows up about once every 13 Boundaries Crossed packs.
Kanako Eo drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Boundaries Crossed booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.