Name: Mermaid
Element
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Cost: ?
ATK|HP: ?
Ability:
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|

, Target empty spot on the field is flooded. If Mermaid dies, upkeep is

.
Would this work? Of course card would have to be built around, but there are already plenty out there requiring flooding, this could help.
Also:
Name: Dark Mermaid
Element:

Cost: ?
ATK|HP: ?
Ability: X spots are cloacked in the middle row, X is the amount of flooded spots in the middle rows of the field.
Any suggestions?