The Strong Ultimate is Immediate and Doesn't Kill Sorin - There are a few modern planeswalkers, such as Gideon, Ally of Zendikar, that could be dropped quickly, and used with it's ultimate as soon as it arrived, but you had to kill it
Notably, this counts for any nontoken creature dying, not just your own
If someone brings this to a Chaos draft, you can assume that they have a heart of gold, and a terrible pick
Sure, youre cantripping, but this takes up a spell slot in your deck and doesnt help you do what combat tricks are supposed to dowin combat
It could be a fun build around for a Gruul Commander, and go as aggressive as possible
Zoo has some similarities to classic Aggro decks: it is well suited to play against other creature decks given how easily they outsize other creatures with Territorial Kavu, Tarmogoyf and Scion of Draco