MTG Garruk's ability vs. Mana Pool functionality?

Jestermask

New member
My question is simple enough but there is a thing I want to make sure.

Lets suppose I have Garruk Wildspeaker and I would like to use his first planeswalker ability (+1: Untap two target lands.) during my main phase.

Scenario: If I have 5 untap lands total (forest) that I tap to add to my mana pool, then I use Garruk’s ability to untap two target of my lands, then I tap those two lands again, can I summon Pelakka Wurm which cost 4GGG (7cc)? Is that how Garruk’s ability works? Do I have 7 green mana total in my mana pool?

Thanx!
 
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