Most decks run both if theyre aiming for that win condition, but Exsanguinate is positioned much better in the current metagame, where gaining life can often grant you another whole turn that you wouldnt have otherwise had access to
Its sort of the game designer's way of signaling, Hey, this card is important! Every new set of cards that comes out takes place in a different world (called planes), so the legends of each plane tend to pop up whenever a new set comes out in a plane the game has already visited
Especially if youre a creature-heavy deck without a ton of haste, youll almost always be able to swipe some of Farmer Maggots crops or a snack from Bilbos eleventy-first birthday party just by tapping newly cast folks on opposing end steps
Bargain, another of Wilds of Eldraine s new mechanics, plays into the classic trope of bartering with the wicked enchantress
So not only does your opponent have to keep track of all the changes, but they have to be aware of that rules interaction
Ah yes, Mindslaver was printed in Mirrodin, which meant that Gleemax needed to have a new Oh no
