According to the official announcement article from Wizards of the Coast, Non-foil versions of these drops will be available at WPN game stores for purchase at a later date. So yes, you can expect to find these in a larger LGS near you some time after the initial release
Although it requires a high amount of energy in order for it to be used, the 240 total damage is enough to knock out many of the strongest cards in this set
The card lets you win the game if you have an almost empty library when you play it, making it the perfect card to play alongside infinite draw or self-mill combos
While the demand is genuinely massive, the supply of the most expensive Sun & Moon booster boxes is relatively low, resulting in sky-high prices
However, it stands above every other card in its variety of Pokemon, with regular Gardevoir, Kirlia, and Ralts each appearing in a swirling circle around Mega Gardevoir