I also feel that Genesis Ultimatum has no Red either, it draws and puts permanents into play so it's Blue and Green
While it's not going to be a big play on a small board, any deck that can throw out lots of creatures, like a tokens or aggro deck, will suddenly become the end of the game
With the release of Bloomburrow, four sets have no longer become legal for Standard play
Add in the fact that the card is actually a good legendary Blood Artist that provides card draw and a strong finisher in Sephiroth, One-Winged Angel, and I have to say that this is a 10/10 design and a great commander
Dark Confidant, Aether Vial, and Howling Mine are examples of cards with triggers in one of these phases, and can therefore affect how players wish to interact with them