I wouldnt go so far as to call her a staple, but she might end up being one given enough time
The idea here is to have a control shell with a lot of counterspells, some removal spells, and good value creatures to stabilize
Even if the new framing and the different artwork might not be appealing to some players, this is again, a $2 card we are talking about
Its busted as hell and is very likely to stay where it is for a long time
This will likely be a major mechanic of the set that will make giving your opponent that third counter a very big deal, also meaning that your other Toxic cards will be working together to help you achieve this goal
Think creatures with delve like Hooting Mandrills, or evoke creatures like Spitebellows