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Oran-Rief, the Vastwood enters the battlefield tapped.
{T}: Add {G}.
{T}: Put a +1/+1 counter on each green creature that entered the battlefield this turn.
Oran-Rief's second ability affects all permanents that are green creatures that entered the battlefield this turn, not just the ones you control.
Oran-Rief's third ability cares about permanents' characteristics at the time the ability resolves, not their characteristics at the time they entered the battlefield. For example, if a blue creature enters the battlefield, then is turned green by a spell or ability, then Oran-Rief's second ability resolves, you'll put a +1/+1 counter on that creature.
