Vigilance is fantastic in Commander where it allows you to attack and still ward off attacks from 3 other players, and it's even better on flyers like Birds
Its such a pain to play against, too, as it does the things you dont want it to at the worst possible times
This incentivizes the use of self-milling abilities as well as creatures with a litany of keywords, and once these ability counters have been put on creatures, Kathril gets that many +1/+1 counters, allowing it to serve as a noteworthy threat in its own right
Naturally, this also makes Miirym into another commander that can win the game using a Worldgorger Dragon
The game is a direct sequel to the first Pokmon Trading Card Game and continues right after you beat the Grand Masters - which is when Team Great Rocket steals all of your cards, requiring you to start from scratch