During your Battlephase, if this card makes a second attack, inflict damage to your opponent equal to half the ATK of the attacked monster
Combine all this with an easier quest system, where you can complete your objectives (things like "knock out 3 Basic Pokmon") in normal play, and you get into the meat of the game immediately
The game would also not need to be balanced like the mainline games, since it would just use the current version of TCG and wouldn't have its own competitive version
Modern Horizons 2 was the only other set to do this
An anti-hero featured within the Pokmon Black and White video games released on the Nintendo DS, like many of the very best Pokmon cards his card became popular for competitive reasons
We recently had a mono-blue one printed that I built around (Geralf, Visionary Stitcher, a budget commander here)