Lee Sharpe tweeted this update to the MTGO Banned/Restricted lists today, as of the May 25 (note, not April 25) 2011 downtime, the following change will take place.

Destructive Flow will be banned in the Kaleidoscope format. For those of you unfamiliar with the format, it is succinctly describe as this:

Kaleidoscope is a new Magic Online-only Constructed format. It uses the Extended Legacy card pool with the exception that all nonland cards in a Kaleidoscope deck must be multicolored. This includes gold cards, hybrid cards, and most split cards.