Zweilous is card #85 of 114 in Steam Siege (2016), a Uncommon illustrated by Ken Sugimori. At about $0.42 it is the #95 most valuable card in the set. In a Steam Siege booster it turns up about once every 9 packs. It is one of 15 Zweilous cards printed so far.
2011Noble Victories
2013Legendary Treasures
2014Phantom Forces
2016Steam Siege
2017Crimson Invasion
2020Darkness Ablaze
2023Paldea Evolved
2024Surging Sparks

















See the full Steam Siege card list
An ungraded Zweilous from Steam Siege sells for about $0.42. A PSA 10 is worth more, roughly $2.10 by our estimate, and a PSA 9 around $0.97.
It is a Uncommon, and it shows up about once every 9 Steam Siege packs.
Ken Sugimori 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.