Steam Siege was released in 2016. Steam Siege is grouped under the XY era.
With 116 listed cards, this is a mid-size set by modern TCG standards. As of 2026, the set is 10 years old and now falls into an established back-catalog period.
Ninja Boy (#103) is one of the Uncommon prints in this expansion.
In 2016, Steam Siege introduced this print of Ninja Boy. Its card type is Trainer.
The rarity label is Uncommon. This gives collectors a clear identity footprint for the print.
Card subtype classification is Supporter. The card text reads: Choose 1 of your Basic Pokémon in play.
Search your deck for a Basic Pokémon and switch it with that Pokémon. (Any attached cards, damage counters, Special Conditions, turns in play, and any other effects remain on the new Pokémon.) Shuffle the first Pokémon into your deck.
For Ninja Boy in Steam Siege, the current reference price is $0.13. Week-over-week change is limited (0.0%), indicating short-term stability.
That is close to the 30-day average of $0.13. The 90-day window shows a floor near $0.12 and a peak around $0.14 (15% total spread), which maps to low-volatility movement.
This version is categorized as Uncommon.
Collector-focused market read: The latest week is near flat (0.0%), suggesting consolidation rather than breakout behavior. Observed 90-day bounds of $0.12 and $0.14 create a 15% band, matching a low-volatility profile.
Current value remains close to its 30-day mean ($0.13). No consistent graded benchmark is available in this snapshot, so condition-adjusted pricing should be reviewed with active listings.