It places said counters on other creatures, it goes back to your hand when it dies, and, more importantly for our purposes, it draws you cards whenever a creature with a -1/-1 counter on it dies
While this doesn't means anything in terms of the expected value right now, which is admittedly pretty good, if your plan is to crack a box or two and hold on to the cards, keep in mind that their prices will likely be dropping over the coming month, which means buying singles is still probably the way to go for building a collection
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3 Pikachu ex Key cards: Pikachu ex, Zapdos ex, Electrode The Pikachu ex deck is the strongest Genetic Apex deck, at least for the first few turns of a battle
If you have a Crab on the battlefield and could fetch up the mana to cast another Crab, its actually more mill if you let the fetch sit and use your existing mana to cast the Crab next turn