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Whenever another creature enters the battlefield under your control, put a +1/+1 counter on that creature and a +1/+1 counter on Juniper Order Ranger.
The creature doesn't enter the battlefield with a +1/+1 counter on it. It enters the battlefield, then the ability triggers. If either that creature or Juniper Order Ranger leaves the battlefield before the ability resolves, the remaining creature will still get a +1/+1 counter.
