Historical Rules · 7 October 2022
Rule 123.1
Official source text from the 7 October 2022 Rules release
A sticker is a marker placed on an object that modifies its characteristics and/or interacts with a rule, ability, or effect. Stickers are not objects. Notably, a sticker is not a counter or a token. Changes to an object from stickers are not part of its copiable characteristics. There are four kinds of stickers: name stickers; ability stickers; power and toughness stickers; and art stickers.