This effect can find your commander in all zones, including your library or hand and the stack
Now, since the Quicksilvers ability is a new instance each time it copies Vivi, you get a fresh activation
The Phyrexians are making Mite tokens, which are all 1/1s with Toxic 1 that cant block, and the other side is making 2/2 Rebel tokens that come in attached to equipment with the For Mirrodin
The final mode, which is essentially a one-sided full board wipe when played right, is also excellent at six mana
After all, in the first few turns of a Magic game you aren't casting every card in your hand
If you do decide to use Satoru Umezawa in a ninjutsu deck, it still has an added benefit