Advanced format ruling
Aqua Spirit
Card effect (current official text)This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing from play 1 WATER monster in your Graveyard. During each of your opponent's Standby Phases, you can change the battle position of 1 of your opponent's face-up Monster Cards. Once changed, the monster must remain in this position for the rest of the turn.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.