What if it is a triggered ability that check on stat changes like:
Whenever <Cardname>'s Power or Toughness becomes 3 or greater, it gets and indestructible counter.
Whenever <Cardname>'s Power or Toughness becomes 2 or lower, remove all indestructible counters from <Cardname>'s.
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Whenever <Cardname>'s Power or Toughness becomes 3 or greater, it gets and indestructible counter.
Whenever <Cardname>'s Power or Toughness becomes 2 or lower, remove all indestructible counters from <Cardname>'s.