sword & shield rebel clash booster box Amazon.com: Pokémon TCG: Sword & Shield-Rebel Clash Elite Trainer Box, Multicolor : Toys & Games
Description
Reactor Slime: During your Main Phase: You can activate this effect

Pack contents: 5 cards per pack

I couldnt find any info on what the other 10 cards in the pack are

In Japan, it was released asMystery of the Fossils, the third expansion in the Pokmon Card Game

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Shipping Estimate
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Ships within 48 hours · Estimated delivery Aug 4 - Aug 9