Cyclonic Rift is arguably the most powerful blue card in the Commander format, and almost always considered an "auto-include" in any deck that has blue mana. This is because of its very forgiving mana cost (only requiring one blue mana) and always being useful as a two-mana bounce spell before the overload even is available to you. Wiping all three opponents' boards in a four-player game at end of turn is devastating.
We're here to help. Whether it be countering it, copying it, stealing it or simply "not being there," you will find options in almost every color to deal with this pesky Return to Ravnica bomb.