Hibernation Grounds

{t}, Exile a Squirrel and put a Hibernation Counter on it: Add two manna of any color
to your manna pool.
{w}{u}{b}{r}{g}, {t}, sacrifice Hibernation
Grounds: Return all Squirrles from Exile with a Hibernation Counter on them to the battlefield under your control.
Just cause they rest, does not mean you're safe.