Pseudo Space is a Field 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, Pseudo Space is Unlimited.
YGOPRODeck lists Pseudo Space for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Pseudo Space appears in Ancient Prophecy (ANPR-EN087) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Pseudo Space is about $0.31 on Cardmarket (prices change frequently).
