It provides incentives to examine core Magic gameplay through yet another new lens, and approach Constructed creature decks in a way that was otherwise falling out of fashion
If the permanent copied by the token had any "when [this permanent] enters" abilities, the token also has those abilities, and they'll trigger when it's created
Slowing them down by taking Noble Hierarch isnt that relevant, and while I might be able to beat one Collected Company with a well-placed Snapcaster Mage, the second is going to suck
Omnath, Locus of Creation decks arent quite doing that just yet, but I think theyd rather run only the one Nissa
Then, Professor Onyxs ability will trigger, dealing 2 damage to each opponent and Chain of Smog will resolve, you will discard two cards, and you can choose to copy it
This also opens the door for new innovation and decks to build