At the beginning of your upkeep, sacrifice this enchantment unless you pay .
Blue creatures get +1/+1.
Illustrated by Jesper Myrfors · Fourth Edition Foreign Black Border · #106
There are no rulings for Sunken City.
At the beginning of your upkeep, sacrifice this creature unless you pay .
Enchant creature
Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost."
Other enchantments have "At the beginning of your upkeep, sacrifice this enchantment unless you pay ."
Players skip their untap steps.
Flying
Shadow (This creature can block or be blocked by only creatures with shadow.)