Hivemind

When Hivemind enters the battlefield choose a
creature you control. As long as you control at
least one untapped land of each color, every
other creature you control has the power and
tougthness of choosen creature.
When choosen creature is destroyed, destroy
Hivemind unless it is tapped and a creature is
choosen.
{5}, {t}: Choose a target creature you control. It
is the new choosen creature.