The Galarian Gallery cards featured extended-art illustrations that placed Pokemon in richly detailed, atmospheric environments rather than the standard isolated battle-pose compositions, and the Mewtwo VSTAR was one of the most impressive entries in the entire subset
If the activation timing is incorrect, the effect is negated and destroyed
In Commander, that usually means forty or more if you build around lifegain
The expected value calculation is up on the prices page (minus collector boosters which will be coming soon once we add in the Commander Precon cards that were just previewed) and the biggest takeaway is that the set is currently massively overpriced with the expected value of a draft booster box coming in at $208 and a set booster box at $305
While this may be a coin flip effect, it is still worth it just for the potential disruption
Discarding an island is just much more difficult than discarding a blue card, especially with greedy mana bases, but its still doable