The Sphinx is a great counterpart to an adapted Aeromunculus, but if that Adapt hasnt been applied yet, then you are free to attack and still preserve the blocking ability
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You are mostly going to lose because when you start playing these online games, youre going to encounter people with battle decks built out of ridiculously powerful V and VMAX/VSTAR cards, or people with the most astonishingly complicated evolution decks where their every card appears to cause a cascading chain of other cards to appear, while you sit there dumbfounded, until they eventually play one attack that not only clears out your entire bench of Pokmon, but also breaks your favorite mug and opens a crack in your kitchen ceiling
There is no doubt that it is a strong card if you can play it, but I think green has enough mana usage in the mid-game and beyond, so I don't think you have to take it forcibly