With Eriette at the fore, each enchantment you cast is another nail in your opponent's coffin, eventually draining their life while filling yours
Attacks that would be effective could end up wasted on small bodies and trigger On K.O
You have infinite ways to express yourself, from the Commander you pick to the cards you put in the 99, the win conditions, the removal, the ramp its all customizable down to the last detail, and thats even before you consider what basic lands to pick, what foils and showcase arts to choose, and even your sleeves and deckboxes
Since Black Bolt and White Flare just granted one to every single Unovan Pokmon, I assumed the first Pokmon region must be virtually ticked off, but it's not so
Also, consider how popular a card is