She costs X less where X is the combined power of all our critters, and she has Trample
Everything that can be sacrificed is going in the graveyard, every removal spell is aiming in the wrong direction
Armament of Nyx Hero of the Nyxborn Nykthos, Shrine to Nyx Nyx Nyx Herald Nyx Infusion Nyx Lotus Nyx Weaver Nyx-Fleece Ram Nyxathid Nyxbloom Ancient Nyxborn Behemoth Nyxborn Brute Nyxborn Colossus Nyxborn Courser Nyxborn Eidolon Nyxborn Hydra Nyxborn Marauder Nyxborn Rollicker Nyxborn Seaguard Nyxborn Shieldmate Nyxborn Triton Nyxborn Unicorn Nyxborn Wolf Onyx Goblet Onyx Mage Onyx Talisman Professor Onyx Satyr Nyx-Smith Starfield of Nyx
I also think that unless Ob Nixilis proves playable in Pioneer or Modern, you might want to trade off any ones you arent actively playing with sooner rather than later
In Limited, I can see it being a nice pick in draft
If you are looking for something less high fantasy in style, you can always find scans from different card games - Card Game Database is a good starting point