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I have also found a number of examples for more modern sets which will be discussed here in due time

Keep in mind that Dollar Tree inventory can vary greatly by region

Any effects that applied to that permanent will continue to apply to it after it transforms

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