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Equivalent cards in green:
1. Arlinn's Wolf (for the +2/+2 and reach, but it's a creature, not an instant)
2. Spider Umbra (grants +1/+1 and reach, also totem armor)
3. Moonlight Hunt (situational, but removal in green at instant speed)
4. Snarespinner (creature with reach, interacts well with flyers)
No exact equivalent in mono-green does both +2/+2 and untap and reach at instant speed, but Arachniform (grants reach and +2/+2, but it's an aura) is very close.
All the above share being green and interact with reach or similar pump effects.
