It depends on how well you can play on words
For example, you could say that you are a casino with a house edge starting as low as 0.5%. And even if all your games but one have a house edge of, say, 5% (like Mupltiply at Freebitco.in), technically you wouldn't be lying. The devil is in paying precious attention to details (as well as conjunctions and prepositions)
Apart from that, while with dice the house edge is obvious (like you lose above 49.5 on Low, then the house edge is 0.5%), that may not be so with other games (like already mentioned BlackJack, as far as I know). So there's another dimension to twist and distort the meaning of what you might want to convey