Grakmaw, Skyclave Ravager {1}{B}{G}
Legendary Creature — Hydra Horror
Grakmaw enters with three +1/+1 counters on it.
Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw.
When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw.
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Reyhan, Last of the Abzan 100%
#6175
"this card enters with three +1/+1 counters on it."
+1 more matching line
Gorma, the Gullet 92%
$1.72#8339
"Whenever another creature you control dies, put a +1/+1 counter on this card."
Aang, A Lot to Learn 92%
$0.15#21201
"Whenever another creature you control dies, put a +1/+1 counter on this card."
Vogar, Necropolis Tyrant 91%
#13624
"When this card dies, draw a card for each +1/+1 counter on it."
+1 more matching line
Mausoleum Harpy 90%
$0.05#28744
"Whenever another creature you control dies, if you have the city's blessing, put a +1/+1 counter on this creature."
Judge Magister Gabranth 90%
$0.27#9346
"Whenever another creature or artifact you control dies, put a +1/+1 counter on this card."
Guardian Kirin 89%
$0.10#23923
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed 89%
$0.24#19316
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Voracious Vermin 89%
$0.30#5618
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Rot Shambler 89%
$0.26#13229
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Feral Ghoul 89%
$3.55#4051
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
+1 more matching line
Unruly Mob 89%
$0.16#17503
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Overgrowth Elemental 89%
$0.30#18539
"Whenever another creature you control dies, you gain 1 life. If that creature was an Elemental, put a +1/+1 counter on this creature."
Gimli, Mournful Avenger 88%
$0.30#14309
"Whenever another creature you control dies, put a +1/+1 counter on this card. When this ability resolves for the third time this turn, this card fights up to one target creature you don't control."
Uglúk of the White Hand 88%
$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."
Yahenni, Undying Partisan 87%
$0.28#1014
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Legolas, Counter of Kills 87%
$0.14#9564
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Sephiroth, Planet's Heir 87%
#11101
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."