Official rule text
92.1 During the action phase, if the active player has the “Trade” 93.5 A player can exchange their trade goods with other players strategy card, they can perform a strategic action to resolve during a transaction. that card’s primary ability. To resolve the primary ability on the
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 92.1