Overgrowth Elemental 

Creature — Elemental
When this creature enters, put a +1/+1 counter on another target Elemental you control.
Whenever another creature you control dies, you gain 1 life. If that creature was an Elemental, put a +1/+1 counter on this creature.
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Laid to Rest 89%
$0.26#11522
"Whenever a creature you control with a +1/+1 counter on it dies, you gain 2 life."
Gladehart Cavalry 89%
$0.31#18311
"Whenever a creature you control with a +1/+1 counter on it dies, you gain 2 life."
Grakmaw, Skyclave Ravager 89%
$0.37#9711
"Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on this card."
Gate to the Afterlife 86%
$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."
Reyhan, Last of the Abzan 86%
#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."
The Meathook Massacre 86%
$27.65#505
"Whenever a creature an opponent controls dies, you gain 1 life."
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."
Sultai Flayer 83%
$0.10#23529
"Whenever a creature you control with toughness 4 or greater dies, you gain 4 life."
Uglúk of the White Hand 82%
$0.20#10126
"Whenever another creature you control dies, put a +1/+1 counter on Uglúk. If that creature was a Goblin or Orc, put two +1/+1 counters on Uglúk instead."
Gorma, the Gullet 82%
$1.72#8339
"Whenever another creature you control dies, put a +1/+1 counter on this card."
Aang, A Lot to Learn 82%
$0.15#21201
"Whenever another creature you control dies, put a +1/+1 counter on this card."
Bhaal, Lord of Murder 82%
$0.27#15505
"Whenever another nontoken creature you control dies, put a +1/+1 counter on target creature and goad it."
Mausoleum Harpy 81%
$0.05#28744
"Whenever another creature you control dies, if you have the city's blessing, put a +1/+1 counter on this creature."