Marill is card #76 of 114 in Steam Siege (2016), a Common illustrated by Shibuzoh.. At about $1.63 it is the #29 most valuable card in the set. In a Steam Siege booster it turns up about once every 6 packs. It is one of 26 Marill cards printed so far.
1999Wizards Black Star Promos
2001Southern Islands
2004Team Rocket Returns
2007Diamond & Pearl
2015Primal Clash
2016Steam Siege
2017Burning Shadows
2023Paldea Evolved

















See the full Steam Siege card list
An ungraded Marill from Steam Siege sells for about $1.63. A PSA 10 is worth more, roughly $8.15 by our estimate, and a PSA 9 around $3.75.
It is a Common, and it shows up about once every 6 Steam Siege packs.
Shibuzoh. 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.