Marcy: I agree with Rob, this is just a miserable Sensei piece, although the only thing about this one that I like more than Counterbalance is that you could just flip over a card and kill your opponent, so that's funny, at least
With Dominaria United and Brothers War's pain lands rotating out, these five lands are going to be very important replacements
Erupting Dreadwolfs triggered ability resolves before blockers are chosen
Whats more, The Ninth Doctor gives you an extra upkeep each turn
Lastly, using Cloudstone CurioCloudstone Curio to return a Summon to hand that has a finality counter on it is another way around the exile effect
However you build it, this promises to be an interesting commander that combines spellslinging with sacrifice potential given that your commander pumps out potential sacrifice fodder