Verzano's ability is:
Active Player: You may store one Grunt, Good, or Gold token on this card. When you use this token, you may take one matching token from the discard pool.
The most important rule is that each card's ability can only be used once per turn. (See Card Abilities on page 7.)
So, one turn, you place one resource token on Verzano's card. It can only hold one token. On a later turn, you can use that token and then you may take one identical token from the discards (the matching token has to be in the discard pool for you to take it). It also doesn't work on double resource tokens.
There is also an entry on page 18 about his ability.