Massacre Girl, Known Killer
Legendary Creature — Human Assassin
Menace
Creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)
Whenever a creature an opponent controls dies, if its toughness was less than 1, draw a card.
- CMC
- 4
- Mana cost
- Color identity
- B
- Rarity
- mythic
- Set
- Murders at Karlov Manor
- Price
- $1.47
- EDHREC rank
- #1637
Massacre Girl, Known Killer enters with menace and immediately shrinks every other creature by -1/-1, turning a board of small blockers into a cascade of death triggers that can spiral into a full wipe before the turn ends. The cost is five mana and a creature-light board state on your side — she punishes go-wide tables without punishing you, but drops in value fast if opponents are running fatty-heavy lists. Auntie Ool, Cursewretch is the clearest natural home, but any black deck that wants a board wipe stapled to a 4/3 menace body has a reason to run her.
Best Commanders
Commanders with the highest synergy
Auntie Ool, Cursewretch
Auntie Ool, Cursewretch cares about creatures dying with -1/-1 counters, and Massacre Girl, Known Killer's enter trigger can seed the entire board with them — turning a single cast into a massive counter-placement event that fuels Ool's payoffs across dozens of creatures at once.
The Reaper, King No More
The Reaper, King No More wants creatures to die in volume, and Massacre Girl, Known Killer's cascading -1/-1 effect can single-handedly clear token-heavy boards and stack the graveyard in one clean sweep.
The Scorpion God
The Scorpion God draws a card whenever a creature with a -1/-1 counter dies, so Massacre Girl, Known Killer's board-wide debuff converts a populated table into a full hand refill before the chain even resolves.
Maha, Its Feathers Night
Maha, Its Feathers Night cares about creatures dying on opponents' turns and during mass-death events, and Massacre Girl, Known Killer's enter trigger reliably manufactures those events — threatening a wipe the moment she lands.
Altaïr Ibn-La'Ahad
Altaïr Ibn-La'Ahad places -1/-1 counters as part of its assassination mechanic, and Massacre Girl, Known Killer synergizes cleanly by pre-weakening creatures that Altaïr then finishes, accelerating the counter-placement chain.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is where Massacre Girl, Known Killer does her best work — multiplayer tables almost always have enough small creatures to trigger the death chain, and a five-mana wipe with a relevant body attached is a real rate. In 1v1 formats like Modern, Pioneer, and Legacy, she's too slow and too conditional: five mana for a situational board wipe is a liability when opponents can sculpt their board to avoid the chain entirely or just kill her in response. Standard gives her the most play outside Commander purely by default, but midrange and aggro shells there rarely want a five-drop that does nothing against a single large threat. She's legal across every major format except Pauper, but the competitive window is essentially Commander and fringe Commander-adjacent builds.
Key Combos
Combo lines featuring this card
Price Context
Current price
$1.47 cheap tier
At $1.47, Massacre Girl, Known Killer sits in the bulk-rare tier — cheap enough to pick up as a include without a second thought. That price reflects modest competitive demand outside Commander, and it's stable; she won't spike unless a new -1/-1 counter commander breaks out, but she's not trending downward either.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.