Reactor Slime

Level 4 WATER/Aqua Effect
500 ATK / 500 DEF

During your Main Phase: You can activate this effect; Special Summon 2 "Slime Tokens" (Aqua/WATER/Level 1/ATK 500/DEF 500), also you cannot Normal or Special Summon monsters for the rest of this turn, except Divine-Beast monsters. During the Battle Phase (Quick Effect): You can Tribute this card; Set 1 "Metal Reflect Slime" from your hand, Deck, or GY. It can be activated this turn. You can only use each effect of "Reactor Slime" once per turn.

Rulings – Yugipedia

Printings:

Legendary Duelists: Rage of Ra: LED7-EN002 (Rare) - 2020-09-24
Egyptian God Deck: Slifer the Sky Dragon: EGS1-EN020 (Super Rare) - 2021-06-17
Speed Duel: Streets of Battle City: SBC1-ENH05 (Common) - 2023-08-24

Prices:

Cardmarket: 0.19 €
TCGplayer: $ 0.17