That's where the non-voodoo creatures come in. You can rewind the voodoo dolls, or you can rewind the shriekers, but you can't rewind both fast enough to completely stop this deck-type's damage. Even if you do rewind a few shriekers, the sheer amount of gemfinders makes it easier to bounce back. In addition, most decks that rely solely on creatures to win have to deal with 6 basilisk bloods and 3 gravity forces, even if the voodoo dolls are rewound so much as to be unplayable.