The sheer number of flyers that can block and kill Akroma, especially without dying, is quite small
There's also always the risk that one of their creatures will be the wrong color, or it will fly, or something similar will go wrong, and the creatures that can't attack are still around to prevent you from winning the game in the meantime
This could result in your opponents being attacked, or it might prevent players from attacking at alleither of which benefit the kind of deck that wants these effects in the first place
I know opening a new pack feels great, especially when drafting with friends (check out our article about the best draft formats), but dont overdo it
As collectibles, however, the Pokemon Go set is one of the most stunning TCG expansions in recent memory