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The game checks the power and toughness of the creature that just entered as it exists on the battlefield. That might mean it's impossible to get another copy of that same card. For example, a Triskelion on the battlefield is 4/4, but a Triskelion in your library is 1/1. The power and toughness might also have been affected while the triggered ability was on the stack (such as with Giant Growth, Sudden Death, or Ovinize).
If you cast a 2/2 Grizzly Bears, for example, you may then search for any creature with total power and toughness 4. It can be 0/4, 1/3, 2/2, or 3/1.
If the creature that entered has left the battlefield by the time the ability resolves, use the power and toughness of that creature as it last appeared before leaving the battlefield.
