text: If a permanent that's already on the battlefield without time counters on it becomes a copy of a permanent with vanishing, it will stay on the battlefield indefinitely (unless time counters are somehow put on it later). If a permanent with one or more time counters on it becomes a copy of a permanent with vanishing, it will vanish as normal. If a permanent enters the battlefield as a copy of a permanent with vanishing, it enters with the appropriate number of time counters and will vanish as normal.