pokemon 1st edition shadowless booster pack PSA 8 1999 Base Charizard – The Pokécave Opening A SHADOWLESS LONG CRIMP

One of the Cosmoem you linked would fall into this category, but note that it's not a good example because 1) it's an evolved Pokemon, meaning it takes resources to establish, and 2) it's got a substantial retreat cost

While the other one acts as a defensive wall with his blocker keyword, protecting your Leader from an attacker

With the Modified theme, you get to give all your creatures a boost in power, upgrading them turn after turn with a number of spells to keep them above your opponents

Comes with 10 booster packs, each containing 10 cards, for a total of 100 premium cards

In tournament play, this means your sideboard

Where it differs sharply is in how you buy it