Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Psychic Pokemon Psychic Stage 2: Gardevoir / Gallade ( Platinum 8, Secret Wonders 6, Secret Wonders 7, Ancient Origins 54, Secret Wonders 131) If I were good at math and I were to give a rough estimate on how often the Gardevoir line gets drafted in a Cube, I would say by the most conservative of estimations, that this line gets drafted 100% of the time
Especially in the early turns, it can be difficult to decide whether you should spend your mana on a face-down creature, which could affect the game later, or spend it on something that will build your board state now
Snorlax If you want to force your opponent to have a certain Pokemon in the Active Spot until you take it down, you can use Snorlax, which has Block as its ability
Additionally, it is Terastallized with a Water Tera type, which can drastically change any gameplay tactics on the table