Enchantment, 3G (4)
Rare
Mana pools don't empty as steps and phases end.
Freyalise promised a dawn that would never end, a day of limitless life. As many dread her promise as revere it.
Illus. Chippy

10/1/2009: Players can keep mana in their pool indefinitely while this is on the battlefield, but once it leaves the battlefield, they have until the end of the current step (or phase) to use the mana before it disappears.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern