Rules glossary
↑ Parent rule: 122.1 A counter is a marker placed on an object or player that mod…
122.1a A +X/+Y counter on a creature or on a creature card in a zone other than the battlefield, where X and Y are numbers, adds X to that object’s power and Y to that object’s toughness. Similarly, -X/-Y counters subtract from power and toughness. See rule 613.4c.
No sub-rules.