This is one of the rare examples of a secret rare card in this set that is not a duo or team of some kind, but rather just one character
For more thematic stuff, the reskinned Sword of Truth and Justice is a slam-dunk here, giving all the counter synergy stuff but also evasion for easier combat triggers
Toxic Deluge Toxic Deluge is the best sweeper in black, especially as indestructible proliferates across cards
The upside is that when someone wipes the battlefield, Genestealer Patriarch will give us a quick recovery, seeing all the creatures with infection counters die
Offspring doesn't copy things like auras or equipment attached to the parent, though
being a legendary creature is a happy little accident Bob Ross would be proud of