You evaluate the condition when the Power is executed, not when the effect happens. For instance, The Trees and Stones Speak of War (without the threshold) gives Damage and Defense per Dahan present at the time you execute the power, not Dahan present during the Ravage Step.
Do Range buffs apply to Powers that affect "a land with your Presence" or "one of your lands"?
No. "A land with your Presence" specifies a requirement for the land you're affecting (similar to, eg, "a land with Dahan" or "a land with Blight"), not a numeric Range. While it is usually the same in practice as "a land at Range 0", when using effects that modify Range the distinction matters.
For powers like Punish Those Who Trespass or Firestorm that have a base effect with normal range and a further effect referring to "lands where you have presence", the range on the base effect can be extended, but the further part cannot.
For instance, if you reach all the thresholds of Punish Those Who Trespass and have extended range, you can use the base effect to deal damage in a distant land and use the further part to deal damage where you have presence (without extension). (Discussion elsewhere) Tags: Range, Presence, Targeting, Reaching Grasp, 10 more...
