This is a very powerful deck that takes advantage of synergies and combos between cards that gain life, and cards that benefit when life is gained
Notably, Dour Port-Mage also triggers if your creatures get exiled directly from the battlefield, whether that's with your own blink effect, or with an opponent's exile removal like Banishing Light
So any time any nontoken creature enters the battlefield, you can destroy it if it belongs to an opponent and there is nothing else more pressing that needs destroying
And often, the newer cards are more powerful anyway, so the cards in my old collection were going to get a bit stale over time
At the time mill decks tended to be mono-blue or white-blue and were all about controlling the environment, using milling as a win condition once control was established
But then the mini-game begins: what card are they going to get instead