We may never know exactly how many are lurking around for public collection, but that only adds to the mystique
Magic: The Gathering Arenas economy can be a tricky thing to work around
I will use one of the packs as an example: You can see the copyright is marked 1995, while the product also clearly states it was made in 1996
So, if Wolverine is blocked by two creatures with four power, the first phase of combat takes place, and he is dealt four damage, but as he attacks the second creature, the existing four damage is healed before he is dealt the second round of damage
This means that if a creature an opponent controls dies while you control Fecundity, and you lose the game before Fecundity's triggered ability resolves (perhaps because you lost the game at the same time that the creature died), that player won't draw a card.
Magic: The Gathering has a rich history, and The Brothers War is a set that leans into it as much as any set outside of Time Spiral, as befits a set coming out as Magic celebrates its 30th birthday