One major aspect that works in its favor is that it only costs four mana, and it's a 4/4 legendary creature with flying and vigilance, but it gives all instant and sorcery cards in your hand "Casualty 1", which lets you sacrifice a creature as an additional cost when casting a spell to copy it with new targets
Either way the top Lost Origin chase cards have a little something for everyone
A Good Thing (playtest) Alchemist's Gambit Amulet of Quoz Archfiend of the Dross Chance for Glory Demonic Pact Enduring Angel Final Fortune Forbidden Crypt Form of the Squirrel Glorious End Immortal Coil Intervention Pact Last Chance Lich Lich's Duel Mastery (playtest) Lich's Mastery Marina Vendrell's Grimoire Nefarious Lich Nine Lives One with Death (playtest) Out of the Tombs Pact of Negation Pact of the Titan Phage the Untouchable Rocket-Powered Turbo Slug Seek Bolas's Counsel (playtest) Slaughter Pact Summoner's Pact Transcendence Warrior's Oath
, Sacrifice another Vampire or Zombie: Put two +1/+1 counters on Kalitas
Mirage Mirror has been showing up more and more over the past couple years, and it has proven to be an all-star in Commander
It also has the same edge case as Fanatical Firebrand: if you need just a little more damage to win, this is a winning top deck