Tegwyll is a fairly aggressively-costed commander at only three mana and has both flying and deathtouch, making it a deadly creature to contend with
Avacyn Flash Tempo on Moxfield (Selesnya) Mirri, Weatherlight Duelist I had Mirri built already before I started this challenge, and I still like her
Its still a situational card, but one that can stay around the $5 mark if adopted by the Commander community
One of the key aspects of the game is the various game mechanics
With more card draw, you can control games with cards like Organic Extinction, play huge spells like Wake the Past, and get your big creatures and planeswalkers like Brudiclad, Telchor Engineer and Ugin, Eye of the Storms more reliably
So far assassins have only taken a single victory in my cube and that wasn't the correct way to play that particular game