Kamber, the Plunderer {3}{B}
Legendary Creature — Vampire Rogue
Partner with Laurine, the Diversion (When this creature enters, target player may put Laurine into their hand from their library, then shuffle.)
Lifelink
Whenever a creature an opponent controls dies, you gain 1 life and create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
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Cards that do something similar expected a card that isn't here?
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The Meathook Massacre 92%
$27.65#505
"Whenever a creature an opponent controls dies, you gain 1 life."
Altac Bloodseeker 89%
$0.05#28648
"Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn."
Bounty Board 88%
$2.06#5072
"Whenever a creature with a bounty counter on it dies, each of its controller's opponents draws a card and gains 2 life."
Blight Mound 87%
$0.42#3968
"Whenever a nontoken creature you control dies, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life.""
Sultai Flayer 87%
$0.10#23529
"Whenever a creature you control with toughness 4 or greater dies, you gain 4 life."
Gate to the Afterlife 87%
$0.20#11193
"Whenever a nontoken creature you control dies, you gain 1 life. Then you may draw a card. If you do, discard a card."
Yahenni, Undying Partisan 85%
$0.28#1014
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Legolas, Counter of Kills 85%
$0.14#9564
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Sephiroth, Planet's Heir 85%
#11101
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Kraven the Hunter 85%
$0.22#14434
"Whenever a creature an opponent controls with the greatest power among creatures that player controls dies, draw a card and put a +1/+1 counter on this card."
Vindictive Vampire 85%
$0.38#4208
"Whenever another creature you control dies, this creature deals 1 damage to each opponent and you gain 1 life."
Invasion of Ulgrotha // Grandmother Ravi Sengir 84%
$0.16#17996
"Whenever a creature an opponent controls dies, put a +1/+1 counter on Grandmother Ravi Sengir and you gain 1 life."
Laid to Rest 84%
$0.26#11522
"Whenever a creature you control with a +1/+1 counter on it dies, you gain 2 life."
Gladehart Cavalry 84%
$0.31#18311
"Whenever a creature you control with a +1/+1 counter on it dies, you gain 2 life."
Slaughter Specialist 84%
$0.87#4561
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Malakir Cullblade 84%
$0.15#15878
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Reyhan, Last of the Abzan 83%
#6175
"Whenever a creature you control dies or is put into the command zone, if it had one or more +1/+1 counters on it, you may put that many +1/+1 counters on target creature."
+1 more matching line
Slimefoot, the Stowaway 83%
$0.18#5267
"Whenever a Saproling you control dies, this card deals 1 damage to each opponent and you gain 1 life."