We've seen Lillie's Clefairy ex, Marnie's Grimmsnarl ex, N's Zoroark ex, and N's Reshiram
III - Draw two cards for each opponent who controls fewer creatures than you
It also means theres the window of opportunity to cut 1 Archeops for more consistency to find this one-of card, I would aim for a route to search for it with Arven and gear the deck towards this, if anything

Akroma, Angel of Fury Akroma, Angel of Wrath Akroma, Vision of Ixidor Anya, Merciless Angel Archangel Avacyn Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Aurelia, Exemplar of Justice Aurelia, the Law Above Aurelia, the Warleader Aurelia, the Warleader Avacyn, Angel of Hope Avacyn, Guardian Angel Avacyn, the Purifier Basandra, Battle Seraph Brisela, Voice of Nightmares Bruna, Light of Alabaster Bruna, the Fading Light Drana and Linvala Errant and Giada Feather, Radiant Arbiter Feather, the Redeemed Firja, Judge of Valor Gabriel Angelfire Giada, Font of Hope Gisela, Blade of Goldnight Gisela, the Broken Blade Iona, Shield of Emeria Ixhel, Scion of Atraxa Jenara, Asura of War Kasla, the Broken Halo Liesa, Forgotten Archangel Liesa, Shroud of Dusk Linvala, Keeper of Silence Linvala, Shield of Sea Gate Linvala, the Preserver Lulu, Loyal Hollyphant Lyra Dawnbringer Radiant, Archangel Radiant, Serra Archangel Razia, Boros Archangel Regna, the Redeemer Reya Dawnbringer Rienne, Angel of Rebirth Rodolf Duskbringer Selenia, Dark Angel Sephara, Sky's Blade Sephiroth, One-Winged Angel Shalai and Hallar Shalai, Voice of Plenty Sigarda, Champion of Light Sigarda, Font of Blessings Sigarda, Heron's Grace Sigarda, Host of Herons Tariel, Reckoner of Souls Tiana, Ship's Caretaker Zamriel, Seraph of Steel

Its also nice to have a 0-mana sacrifice outlet attached to a commander, though this one isnt nearly as powerful as the likes of Yawgmoth, Thran Physician