(3) If a monster(s) is added from the GY to the hand while this card is in your GY: You can add this card to your hand
Ive used my knowledge of the rules to exploit the healing effect of the cleanup step to get more out of my Enrage creatures, as well as using Licids to enchant a creature on the battlefield with Darksteel Garrison, both of which are undeniably jank ideas
But for decks that empty their hand fast, and/or decks that thrive on discard synergies, Windfall can be a 3-mana draw-seven (and even more, if you have ways to force your foes to draw!)
Outside of mono-colored decks, and some decks in older formats that use Fetch Lands, Multiversal Passage can improve multicolored manabases across formats
Edition VRAINS - The Grand Creators - 1st
But that's a risk you take to make the play that is better in more situations