Massacre Girl, Known Killer 
Legendary Creature — Human Assassin · Lorwyn Eclipsed Commander
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.
Plays well with: Card draw, Card advantage, Value engine
Buy this card: TCGplayer · Cardmarket
Decklists on EDHREC View on Scryfall More Mono-Black commanders
📖 How to build Massacre Girl, Known Killer
Known Killer gives your creatures wither, so their damage lands as -1/-1 counters, and menace, so each attacker needs two or more blockers. Its payoff is drawing a card whenever an opponent's creature dies with toughness less than 1. The plan is to shrink opposing creatures with -1/-1 counters until they reach zero toughness, then refill your hand from each death.
Build around -X/-X effects and wither damage that push opposing creatures to zero toughness, such as Toxic Deluge. Add card draw and tutors like Phyrexian Arena, Demonic Tutor, and Vampiric Tutor to find and fuel the engine, and Blood Artist to reward creature deaths.
Known Killer only draws from opponents' creatures dying with toughness below 1, so creatures destroyed while still at positive tough
Deck guide written with AI assistance based on the card's rules text.
🔗 Card draw synergy
$105.01
$3.07
$12.92
$0.33
$3.41
—
$3.25
$0.45🧩 Top staples for this deck
✔️ Auto-includes (you probably already run these): Sol Ring, Command Tower, Arcane Signet, Exotic Orchard, Reliquary Tower, Swiftfoot Boots, Lightning Greaves, Path of Ancestry.
$8.06
$10.31
$62.61
—
$0.22$3.07
$27.12
$51.50$12.92
$1.59$0.33
$3.49⚙️ Colorless all-stars
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$4.93
$11.44$105.01
$49.25
$33.79🪙 Budget picks (under $2€2)
$1.39$0.22$1.59$0.33
$0.41$0.45
$0.27
$1.95👑 Other Mono-Black commanders
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Mono-Black · $102.02
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Mono-Black · $22.01
Mono-Black · $5.97Staples are based on how often cards are played in Commander overall (popularity data via Scryfall/EDHREC) and filtered to this commander's colors. Synergy picks match the commander's rules text.