Flood ruins many fewer games if you run a heavy dose of utility lands. Being able to pump that mana into a Faerie Conclave and chip away at their PW is the difference between a game and non-game of Magic often.
It's important to note that mana sinks don't have to be lands. I'm also slightly wary of spell lands because I do not want to fully support land destruction. Look at the Guildmages from both Ravnica blocks for a creature example. Just about anything with an activated ability that you can use every turn should qualify. Flashback kinda counts, but it's not consistent enough to be something I normally call a good mana sink.