Chain Summoning is a Quick-Play 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, Chain Summoning is Unlimited.
YGOPRODeck lists Chain Summoning for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Chain Summoning appears in OTS Tournament Pack 5 (OP05-EN025) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Chain Summoning is about $0.27 on TCGPlayer (prices change frequently).
