Probopass is card #55 of 114 in Steam Siege (2016), a Rare illustrated by Mahou. At about $0.41 it is the #97 most valuable card in the set. In a Steam Siege booster it turns up about once every 42 packs. It is one of 18 Probopass cards printed so far.
2007DP Black Star Promos
2009Arceus
2015Primal Clash
2016Steam Siege
2017Guardians Rising
2019Cosmic Eclipse
2022Brilliant Stars
2024Twilight Masquerade

















See the full Steam Siege card list
An ungraded Probopass from Steam Siege sells for about $0.41. A PSA 10 is worth more, roughly $2.05 by our estimate, and a PSA 9 around $0.94.
It is a Rare, and it shows up about once every 42 Steam Siege packs.
Mahou drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Steam Siege 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.