Enchantment, U (1) {U}{U}: For each attacking creature without flying, its controller may pay {1}. If he or she doesn't, creatures you control blocking that creature gain first strike until end of turn.1
Illus. Rob Alexander
10/4/2004: Can be used more than once in a turn. Each time, the opponent can pay to prevent giving first strike to a creature, but this payment only stops the current activation and not future activations of Tidal Flats.
10/4/2004: The payment is made when the Tidal Flats effect resolves.
10/4/2004: First Strike is assigned to your creatures currently blocking non-Flyers when this effect resolves.