Muraganda Petroglyphs

Any text on a creature is an ability, even if that text isn't currently applicable (such as a cycling ability of a creature).

If a land with a basic land type becomes a creature, the intrinsic mana ability it has stops Muraganda Petroglyphs from applying to it.

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature with no abilities may become lethal if that creature gains an ability or Muraganda Petroglyphs leaves the battlefield during that turn.