Instead of being facedown and being unable to use, Impending allows the card to be played face up, striking fear into your opponents (while also making the card vulnerable to removal)
The playability of the card is a little more dependent on the meta youre facing, meaning it definitely can overperfom in creature heavy metas while being a bad choice of card in your 75 against a field of combo and control shells
Moving Grass Energy between Pokmon can recover momentum after a knockout, boost a newly played attacker into action quickly, or respond to shifting board states
But a 2/1 for with first strike is pretty good, and the ability to sacrifice it to remove a planeswalker or nerf something that your opponent has built up beyond regular removal is great
It's the kind of concept for a game that seems almost too obvious now that it has been done well, for which OPNeon Games deserves a lot of credit
At its best against Fires and other decks which start slow, or when you can give it extra power or deathtouch