Murmur of the Forest is a Normal Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Murmur of the Forest is Unlimited.
YGOPRODeck lists Murmur of the Forest for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Murmur of the Forest appears in Battle Pack 3: Monster League (BP03-EN174) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Murmur of the Forest is about $0.14 on TCGPlayer (prices change frequently).
