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The former will give you some big splashy turns, while the latter is repeatable for a low investment the ideal

While Paradigm Shift is by no means the primary way most decks using Jace and/or the Oracle empty their library, it is a way to do it and thus it has seen play in Legacy and Vintage, where the Oracle especially is a very common win condition

For many playtest cards, you'll need to make a generous assumption that basic game rules would be updated to allow them to work

Each trigger creates five artifacts in a 4-player game, which is conveniently enough to activate Time Sieve, and the rest is history

Outside of a few very specific cards (which will be mentioned first) that require deck sizes above the minimum, all the other reasons you might want to are more fitting to casual magic: Battle of Wits - A win condition that specifically requires you to have more than 3 times the minimum deck size left in your deck to win means starting with about 4 times that minimum, if not more