Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

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Scour

Once per tactical action, after you gain control of a planet, you may discard 1 action card to ready that planet.
Vaylerian ScourgeFaction ability

Once per tactical action, after you gain control of a planet, you may discard 1 action card to ready that planet.

Source: Discordant Stars