It can move any kind of counters, and isnt locked to one player, so you can throw some -1/-1 counters at an opponent, or snatch their +1/+1 counters for yourself
This is the type of issue that can potentially kill card values
Coldsnap Dark Depths Dark Depths is an interesting design where we created a much-requested character, Marit Lage, but not as a card
The problem with Mental Misstep is that if it's legal, everyone will play it and the format will quickly devolve into weird Mental Misstep wars where you need Mental Misstep to counter your opponent's copies of Mental Misstep
It has a low ink cost of only two as well, so players can easily become like Beast and throw a tantrum, breaking whichever item they choose
Now, along comes Elenda, Saint of Dusk: another 4/4 for one less mana