Gandalf the Grey is the quintessential fantasy wizard, so it made sense for his card design to be blue-red as those are the colors that do the most wizardy things in-game
The Mew card itself is one of four Immersive Cards that have interactive artwork, and by collecting all four Immersive Cards, youll be able to complete yet another one of Pokemon TCG Pockets Secret Missions
Mind you, Im not a hardcore CCG player, and I dont usually seek these experiences out, but Ive got a few friends who play these games competitively or judge competitions, and I trust their assessment based on the Lorcana starter sets
What is double sleeving and why should I do it
Knowing what those cards are becomes part of the information you have access to, just like you can look at the cards in your hand
Add a Karns Temporal Sundering to the mix, and youre attacking for another eleven before they know what hit them