Can't overrides can in Magic, so a Skullcrack foils your Fog, even if you cast the Fog after the Skullcrack
Because many players were able to easily get the promotional items at the time, the collectibles weren't believed to be worth that much
Thanks to this, according to EDHREC, Alela, Cunning Conqueror appears in around 64% of Maralen, Fae Ascendant decks right now
It is also why black is the most common colour alongside blue in legacy and vintage where you need to have some interaction with spells and their potential to be cast so as to not get run over by broken things
It's because it allows players to drain life from opponents
Normally, the big problem is that any kill spell can stop matters