Proliferate is a big subtheme in PAWBO, but between the set which gave us a few Proliferate cards and the precons which seemed to ignore the main set in that regard, we have old cards and new cards that are both getting some new looks
In theory, it is possible to cast Cruel Ultimatum and lose the game, but I have not seen this happen
Qarsi Revenant is a very solid vampire creature that can be thrown into any vampire tribal deck, at least in EDH, and even in the graveyard, it helps you to turn another creature into a monster
Warden requires two mana to hit his second level, which means that in order to activate him on curve youre taking a lot of damage from lands and postponing dropping a tapped land until later turns
In fact, Id argue that the only reason poison is even a viable strategy in Commander is because of the existence of proliferate as a mechanic
A great set of cards