Your search for "Domesticated Watercourse" revealed the following:
Domesticated Watercourse - No Symbol (CMB2) from Mystery Booster Playtest Cards 2021, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Joe Torra Card Text:CARDNAME enters the battlefield tapped.T: Add U or B.U B: Until end of turn, CARDNAME...
Domesticated Watercourse - Symbol (CMB1) from Mystery Booster Playtest Cards 2019, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Joe Torra Card Text:CARDNAME enters the battlefield tapped.T: Add U or B.U B: Until end of turn, CARDNAME becomes...