Lilianas Contract Liliana's Contract offers both card draw and an alternate win condition
Simic Flash is also fairly easy to upgrade, although the end result is a second- or third-tier deck rather than a top-tier deck like Mono-Red Aggro
I suppose you could also blink or flash it in response to removal, perhaps with the aid of Leyline of Anticipation, which is kinda neat too
Currently for Commanders, The First Sliver and Sliver Overlord give you card advantage, the latter and Sliver Queen are combo outlets, and Sliver Hivelord and Sliver Legion are there to increase staying power and damage
With the requirement to not only roll a natural 20 on a D20 but also have no cards in hand while you do it, The Deck of Many Things is certainly punishing
Im sure everyone is going to have a favorite