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When this creature enters, put a +1/+1 counter on target creature you control.
Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it.
Oran-Rief Ooze can be the target of its own first ability.
The group of creatures that receive a +1/+1 counter from Oran-Rief Ooze's second ability is determined only as the ability resolves. Other abilities that trigger on attacking (such as that of Paired Tactician) may add counters to creatures before that ability resolves.
