Thats kind of what i was thinking, as vedalken engineer is your only real acceleration. I might switch them out for 2 more mana leaks
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What is the purpose of the darksteel forge?
This seems good, my only advice would be to have a bit more targeted removal in case they have more creatures than a few big hitters. Jund monsters comes to mind, as they could sacrifice their elvish mystics and sylvan caryatids instead of their big threats. Gild might be good in that case, or some other removal like doom blade. Also, it seems to me that swan song does not have very much synergy with the fact that you are trying to get them to sacrifice creatures, as they could just sacrifice the relatively useless token instead of something important. You could consider replacing it with some other sort of counter, but if you find that that is not a problem I would stick with it. Overall, it's a nice deck.
http://www.mtgvault.com/01123581321/decks/tribal-challenge-ogres/Ogres, because who doesn't like red 4 and 5 drops that never get used ever?