Iron Core Armor is a Equip 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, Iron Core Armor is Unlimited.
YGOPRODeck lists Iron Core Armor for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Iron Core Armor belongs to the Koa'ki Meiru archetype—use that tag when searching for engine pieces and tech options.
A listed print of Iron Core Armor appears in Stardust Overdrive (SOVR-EN053) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Iron Core Armor is about $0.06 on Cardmarket (prices change frequently).
