Both approaches have their merits: Set Collecting: This can be a fulfilling challenge but may require significant time and investment
One of the best decks in Modern, if not the best deck choice, is Jund Midrange, a Black/Red/Green deck that also features Fulminator Mage (#9), as well as the aforementioned Tarmogoyf
If your opponent controls more cards then you do, you can normal summon/set this card without tributing
Like most Pokmon cards, the value of Mewtwo-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (XY Black Star Promos)
If you're buying now, you're catching cards on the way down instead of riding them on the way up