If you have your own deck ideas that youd like to pursue, go for it
The deck is five colored but, like many precons, its mana base is far from optimized
There are certainly decks where it can be backbreaking, such as many of the white aggro decks or against Master of Waves
Even if you give a creature both keyword abilities, it wont deal its first strike damage twice and then deal normal damage again
While Mega Evolution was originally introduced in the XY era, this marks the first time Mega Pokmon ex cards are appearing in the Scarlet & Violet generation
Plus, if your opponents kill this glimmer, you get to keep a non-creature version of the effect on the field