How is that possible some Satan players seed the whole jungle in 20 minutes

Its just, when I throw 3 mushrooms i loose 60% mana, but its useless to build mana items on Satan, I know that runes can give you decent CDR reduction, but I always though AS runes are better for him? Sometimes in the mid game THE WHOLE jungle is just a one big trap house, how people do that on him? Its basically just throwin out all your mana and being useless in any fight that might happen anytime, do they just seed/b/seed/b half of the game time?
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