Historical Rules · 13 October 2023
Rule 700.9
Official source text from the 13 October 2023 Rules release
Some cards refer to modified creatures. A creature is modified if it has one or more counters on it (see rule 122), if it is equipped (see rule 301.5), or if it is enchanted by an Aura that is controlled by that creature’s controller. (see rule 303.4). If an ability of a permanent checks to see whether that permanent is modified, the answer is always no if that permanent isn’t a currently a creature.