pokemon x and y base set booster box XY Pack Moon expansion. Scarlet & Violet Booster Box

Before this week, the card was a neglected $3 bulk rare that saw zero play in constructed formats

When you cast the spell with Prowl, you look back at your turn to see if you've done what it says - dealt combat damage with a card that shares a type with the card with Prowl (so, probably a Rogue, but maybe a Dinosaur and in occasional corner cases, Goblin, Faerie, or Sphinx) You don't still have to control the Creature that did combat damage, you just have to have met the condition of dealing combat damage with the correctly-typed Creature

However, the important thing to note about Narcomoeba triggering is that triggered abilities don't go on the stack when they trigger

One case of play booster boxes contains six booster boxes