Time Sieve needs to be on the battlefield first, and when you begin your upkeep with Thopter Assembly as the only thopter on the battlefield, it will create five 1/1 tokens, which you will use as sacrifices to your Time Sieve
Choosing left or right when it enters locks the table into attacking only one way, which reshapes how opponents interact
On the other side of the coin, if this did improve Pox, that would be good for opposing decks like Delver, with cheap creatures, some burn spells, and Murktide Regent, possibly the best dragon in Magic, which can utilize that swollen graveyard
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Observation 1: His kit is very combat-oriented and rewards you for being aggressive