Talk:Great Spell Circle of Reservoir/@comment-33235220-20190103004536/@comment-26684750-20190103005906

A turn is a single player's turn.

This only works until the end of your or your opponent's turn.

This card is meant to debuff opponent's monsters, which can work for both offense (eg. reducing the defense of a monster to attack it), and defense (eg. reducing the crit of a monster to reduce damage).