Planckton 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, Planckton is Unlimited.
YGOPRODeck lists Planckton for these formats: Speed Duel, TCG, OCG, Master Duel.
A listed print of Planckton appears in World Superstars (WSUP-EN039) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Planckton is about $0.07 on TCGPlayer (prices change frequently).
