Destruction Swordsman Fusion 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, Destruction Swordsman Fusion is Unlimited.
YGOPRODeck lists Destruction Swordsman Fusion for these formats: Duel Links, Speed Duel, Common Charity, TCG, OCG, Master Duel.
Destruction Swordsman Fusion belongs to the Destruction Sword archetype—use that tag when searching for engine pieces and tech options.
A listed print of Destruction Swordsman Fusion appears in 2016 Mega-Tin Mega Pack (MP16-EN215) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Destruction Swordsman Fusion is about $0.06 on Cardmarket (prices change frequently).
