When General Tazri enters the battlefield, you may search your library for an Ally creature card, reveal it, put it into your hand, then shuffle your library.
: Ally creatures you control get +X/+X until end of turn, where X is the number of colors among those creatures.
1/22/2016 The last ability checks only Ally creatures you control as the ability resolves. The value of X will be between 0 and 5. Colorless is not a color.
1/22/2016 Once the last ability resolves, the bonus given doesn’t change, even if the number of colors among your Allies does.