Slip Summon is a Normal Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Slip Summon is Unlimited.
YGOPRODeck lists Slip Summon for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Slip Summon appears in Duelist Pack: Yusei 2 (DP09-EN028) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Slip Summon is about $0.07 on Cardmarket (prices change frequently).
