Teach a man to fish.
The Gatherer is your friend. Once you know how to use it, you can find many of your own answers. You might want to examine the Advanced Search to narrow your search, or the Help Page to get an idea how to search. Explanation of the URL variables above ('?' starts the query, '&' separates variables, Left Hand Side (LHS) is the variable name, RHS is the value of the variable):
action=advanced (gives responses for a greater range of variables)
color=+![G]+![W] (card mana cost does NOT ('!') contain Green AND does NOT contain White mana)
text=[%22sacrifice%20a%20creature:%22] (contains the exact RULES TEXT ('"' is %22, space is %20. URLs cannot contain these special characters, so they must be encoded) "sacrifice a creature:"
You can type your own search examples on the Advanced page, and then examine the URL to see exactly how your query is posted to the database. Technically, this search result would possibly show us cards that don't match the color identity of the Commander, if a card existed that contained a [G] or [W] activated ability, but not a whole lot of these exist. So just for fun, try replacing the RULES TEXT with this search strings.
- text=+![B]+[%22Sacrifice%20a%20creature:%22] This will return all sacrifice a creature activated abilities on cards that don't contain Black Mana symbols on the card. You will note that the botto of page 0 is Quagmire Druid which doesn't match our Commander's color identity.