Enchantment, 2R (3)
Rare
Creatures without flying don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped creatures without flying he or she controls and pay {2} for each creature chosen this way. If the player does, untap those creatures.
Illus. Brian Snõddy

10/1/2008: First the player chooses all the tapped creatures he or she would like to untap this way. Then the entire payment is made at once, then all of those creatures untap at the same time. If the entire payment can't be paid (because the player chose too many creatures, for example), none of it is paid and none of those creatures untap.
Official Reprint Policy (This card is on the reserved list)
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander