Applying these quick lessons to the subjects at hand, Imperial Seal and Vampiric Tutor inherently trade themselves for nothing up front, which isnt going to look good from a card advantage perspective, especially if you dont have enough time to draw the card they tutor
Like most White Weenie decks, while it does eventually win by beating down with a motley crew of creatures, rather than looking to be as aggressive as possible and win as quickly as possible, Death and Taxes looks to slow down the opponent with some strange, synergistic taxing effects and then win at its own somewhat leisurely pace
Since the official text on poison states that any player with 10 poison counters loses the game, theres no reason for this to work any differently in Commander
With that being said, these are also, far and away, the best fetch lands in general