Hero Heart 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, Hero Heart is Unlimited.
YGOPRODeck lists Hero Heart for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Hero Heart belongs to the Elemental HERO archetype—use that tag when searching for engine pieces and tech options.
A listed print of Hero Heart appears in Dark Revelation Volume 4 (DR04-EN157) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Hero Heart is about $0.16 on TCGPlayer (prices change frequently).
