Historically, Final Fortune effects have usually been a part of broken combos rather than backing up a fair plan, so there may end up being no payoff for Glorious End, but in the end, it is certainly a card to watch
The planar core needed to be smaller and less powerful
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.
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Far and away the easiest way to power down a deck, however, is limiting the amount of recursion
It's as simple as triggering landfall, one of the most exploitable abilities in all of Magic