Gengar Exs main drawback is the weak stats of its pre-evolutions, Gastly and Haunter, making it a mountain to climb to reach Gengar Ex
Im pretty sure N-Design did the packaging art but want to be sure
An MnG deck usually has two colors, so pick the two colors you have the most cards in as this will generally give you the most options
You can take a mulligan and re-draw your first cards, but every time you do, your hand gets one card smaller, which encourages you not to bother unless youre seriously screwed over
If you happen to have enough creatures to destroy what you want, thats great, but youd be better off running a similarly priced spell that removes your target like Path to Exile
The Grimer card allows players to search their deck for another Grimer card and add it to their hands