Ocean of Regeneration is a Continuous 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, Ocean of Regeneration is Unlimited.
YGOPRODeck lists Ocean of Regeneration for these formats: TCG, OCG, Master Duel.
A listed print of Ocean of Regeneration appears in Maze of the Master (MZTM-EN036) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Ocean of Regeneration is about $0.18 on TCGPlayer (prices change frequently).
