The Ulfberht Device

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The Ulfberht Device
The Ulfberht Device • Star Alliance • Artifact • Rare • Each player cannot choose the same active house they chose on their previous turn. • Artist: David Tenorio • Card Number: DT:272
The Ulfberht Device
Each player cannot choose the same active house they chose on their previous turn.
“Our best guess is that this was a piece of Architect silverware.” —Scout Pete
DT 272

Commentary

The ability of The Ulfberht Device resolves during each player's "choose a house" phase (Step 2), so it would first resolve during the turn after it enters play, and would prevent the player from choosing the house that they chose in a previous turn. The Ulfberht Device does not have to be in play to be aware of a previous game state, in this case the house chosen by a player in the previous turn.

For example: On turn 1, Player A chooses Dis as their active house. Player B chooses Star Alliance and plays The Ulfberht Device. On turn 2, Player A reaches Step 2, The Ulfberht Device resolves, and cannot choose Dis.