You can go far by just focusing on things like balance, mana curve, and card advantage
Since its initial printing, it has been printed on individual cards from a few sets, but never as a major set mechanic outside Guilds of Ravnica
Black doesn't have many of these, but cards like M.O.D.O.K., Evil Intellect, Gixian Puppeteer, and Construct a Cosmic Cube all pair nicely with a Night's Whisper
This makes it very easy to ramp her up to an incredibly high power which is dangerous for your opponents given she also has Lifelink which heals you for all damage she deals
If you choose the first and third modes, and destroying the creature ends an exile until effect (such as that of Lunarch Inquisitors), the creature will return to the battlefield before you put +1/+1 counters on creatures
9 Yawgmoth's Will Banned in Legacy, Restricted in Vintage, Legal in Commander Blue is probably the worst offender when it comes to overpowered Magic cards, but black also has its fair share