First of all, lets go over the Commander deck called Blight Curse, which apparently is a -1/-1 counters deck in Jund colors
There arent too many reprints that have dramatically influenced price or availability, though Commander 2020 has helped to keep the price of many staples down, like Skullclamp and Lightning Greaves
This is kind of like Nykthos, only bonkers since it's just as good with tokens, and can tap for whatever color you need on that turn
Quoting the Comprehensive Rules: 704.5q If a permanent has +1/+1 and -1/-1 counters on it, then pairs of a +1/+1 and -1/-1 counter are removed from it as a state-based action. Whenever you add a positive or negative counter to a creature, you first remove the opposite counter the creature may have
Poison Counters can be placed on opponents and then proliferated with this card, taking players out of the game in a short handful of turns
These attributes may be changed via the abilities or effects of certain cards