This might be a stupid question... but can I tap [[Evolving Wilds]] without sacrificing it for one colorless mana?

I know that there are Zendikar/Worldwake draft related posts but those are concerned about drafting specific cards. I wonder if the the following distribution of cards in a 40 ca …

[[Omnath, Locus of Mana]] Until the card is officially revealed, it can be seen [here][1]. If green mana doesn't empty from my pool as steps and phases end, that means I can esse …