*Name: Tidal Flats
Type: Enchantment
Play Cost: 1 Island
Game Text: II: All your creatures that are blocking any non-flying creatures gain first strike until end of turn. The attacking player may pay 1 for each attacking creature to prevent Tidal Flats from giving that creature's blockers first strike.
*Source: Front of card
*Name: Tidal Flats
Type: Enchantment
Play Cost: 1 Island
Game Text: II: 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.
*Source: gatherer.wizards.com