Besides the -1/-1 effect on all other creatures, he should have also had an anti-planeswalker ability too. Something like if a PW activates their ability, remove a loyalty counter from that PW. Thus like a loyalty counter tax effect.
I don't agree with the decision since this comes off as to only score some points with certain people. However, by going down this route it will just lead to more and more cards getting the axe.
Hmm, interesting. 3 damage does add up unless answered to. And with my library manipulation effects I could potentially take advantage of the cards he exiles.
Any card you see that may be worth slotting out for him?
Another suggestion for your deck, Strionic Resonator. I noticed you have a couple of cards that could play off of this including your commander's draw ability.
They could be the first Partners that become 5 color.
Inhumanoids which Hasbro owns, seems like a fit following Ikoria for some legendary creatures.
A few cards that can work with it to get that draw. Spellshift, Possibility Storm, Eye of the Storm, Knowledge Pool, Delay.
How is Solemn Simulacrum working for you?