All your creatures that are blocking any non-flying creatures gain first strike until end of turn. The attacking player may pay for each attacking creature to prevent Tidal Flats from giving that creature's blockers first strike.
FE • ENSandra Everingham
™ & © 1993—1994 Wizards of the Coast
Legal in: Legacy,Vintage,Commander
Oracle Text (click to copy):
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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 granted to your creatures currently blocking non-Flyers when this effect resolves.