After that, it'll be released to the public for free, in all sorts of formats, from simple print sheets for paper proxies, to Tabletop Simulator deck objects
But, if you combine her with cards that distribute +1/+1 counters like Halana and Alena, Partners or Guardian Augmenter to give her +2/+2 and hexproof, you can start activating abilities for free
So all you have to do with Karumonix is build a fairly straightforward Phyrexian Rat deck, find a few ways to get them to slip through some combat damage, and start watching those poison counters tick up
In fact, Matt Costa discussed it a good amount in his recent article called Tradeoffs that I highly recommend you go read apropos of nothing else
A great strategic deck can be made out of relatively common cards, if you think it through carefully
She's a one-card toolkit of options, and is still one of the best planeswalker cards to have ever been printed