Wizards of the Coast doesn't often talk about proxying, but fortunately, in its last official statement on the subject, made in 2016, the company made its stance pretty clear
This will work in aggressive decks due to allowing for an early play, but is otherwise uninteresting
Siege-Gang Commander and Sling-Gang Lieutenant - Siege-Gang Commander has been a staple since it was first printed in Scourge
He's back in this set after a few years babysitting Nicol Bolas in the Meditation Realm, and his card is a must-have for colourless decks
The second win condition is Brain Freeze, which helps in strange scenarios where the opponent gains infinite life, yes, thats actually something you can do in PreModern, or when they simply have too many answers for Black Vise