Damage can’t be dealt to an object that’s not a battle, a creature, or a planeswalker.
July 12, 2019 · Core Set 2020
Damage can’t be dealt to an object that’s neither a creature nor a planeswalker.
July 16, 2010 · Magic 2011
rule 120.1a not present in this release
February 1, 2010 · Worldwake
A +X/+Y counter on a permanent, where X and Y are numbers, adds X to that permanent's power and Y to that permanent's toughness. Similarly, -X/-Y counters subtract from power and toughness. See rule 613.3.