This is a symmetrical effect, meaning it hits you too, but in a creature-heavy Hatebear deck, you break that symmetry easily
The less human version is Tovolar, Midnight Scourge, whos a 4/4 with the same card draw ability, but this time around you can pay X, one red, and one green, to give a Wolf or Werewolf you control +x/+0 and trample until the end of the turn, which is a great way to finish someone off
To test this, I grabbed three matching Eclipse Matte sleeves, a KMC Perfect Fit inner, and a KMC Perfect Hard inner to sleeve up three of the flattest Commander Legends foils from my ongoing experiments
Free spells are good
This archetype can be powerful in several formats, but in Commander its efficiency can vary dramatically, and it can also make players who engage in this playstyle the archenemy at the table
Compared to certain generic mechanics like raid, populate is very restrictive where its good