Industry chatter and historic MTG card stock writeups point to a small group of mills that make Corona-type stock, including: Arjowiggins in France Kohler in Germany US Playing Card Company in the USA (for their own decks and some premium stock) The key point: the exact MTG-grade Corona stock is not standard retail stock
If you have a high-value Commander, dropping this to eat some removal later down the line is a great way to redirect some resources
The pro move with Kros is to put that counter on a large creature with haste that just entered the battlefield
As well as that, Coram, the Undertaker is arguably a better fit for your Command Zone than the face Commander, Disa, the Restless
Infused Arrows At instant speed, you can give a creature -X/-X (up to -4/-4 if you pay 4 mana on cast) until the end of that turn simply by tapping Infused Arrows
However, we may see more of her in the future