Eternal Drought 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, Eternal Drought is Unlimited.
YGOPRODeck lists Eternal Drought for these formats: OCG GOAT, Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Eternal Drought appears in Gold Series 4: Pyramids Edition (GLD4-EN033) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Eternal Drought is about $0.09 on Cardmarket (prices change frequently).
