Zephana of the Deep Moon

(If {u/b} was paid with {b}, this creature is blue and black.
Flying, islandwalk, hexproof, prowess
Creatures you control without flying have islandwalk
At the beginning of each upkeep, if Zephana of the Deep Moon is black, you gain 1 life for each island you control.
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"The Deep Moon is rising: Thestria falls."