Sisterhood of Karn 
Creature — Cleric
$0.21 #12120 0.31 2.9 years
This creature enters with a +1/+1 counter on it.
Paradox — Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on this creature.
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Lily Bowen, Raging Grandma94%
$0.51↑#6967↑0.00↓2.5 years
"this card enters with two +1/+1 counters on it."
Mossborn Hydra92%
$12.69↑#777↑0.75↑1.8 years↓
"This creature enters with a +1/+1 counter on it."
Prairie Dog88%
$0.17↓#22868↓0.272.4 years
"At the beginning of your end step, if you haven't cast a spell from your hand this turn, put a +1/+1 counter on this creature."
Ascendant Acolyte86%
$0.34↑#109920.06↓4.5 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Primordial Hydra83%
$1.39↑#2463↑0.45↑15.1 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Hulk, Strongest There Is81%
$0.82↑#16769↓0.00↓0.2 years↓
"this card enters with a +1/+1 counter on him."
Kinetic Ooze80%
$0.29↑#7650↑0.00↓0.4 years↓
"This creature enters with X +1/+1 counters on it."
The Thirteenth Doctor79%
$0.22↑#5057↑0.42↑2.9 years
"Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature."
Rampaging Monument78%
$0.15↓#24248↓0.277.9 years↑
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
+1 more matching line
Swarm Shambler78%
$0.19↓#15078↓0.265.9 years↑
"This creature enters with a +1/+1 counter on it."
Benevolent Hydra78%
$0.89↑#2963↑0.363.8 years
"This creature enters with X +1/+1 counters on it."
Maga, Traitor to Mortals78%
$3.05↑#20136↓0.07↓21.3 years↑
"this card enters with X +1/+1 counters on it."
Slurrk, All-Ingesting78%
$0.29↑#9671↑0.415.8 years↑
"this card enters with five +1/+1 counters on it."
Diamond Knight78%
$0.26↑#15007↓0.08↓7.2 years↑
"Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature."
Grakmaw, Skyclave Ravager78%
$0.36↑#100520.325.9 years↑
"this card enters with three +1/+1 counters on it."
Fractal Harness78%
$0.30↑#6428↑0.07↓5.4 years↑
"When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it."
Solarion77%
$0.67↑#22258↓0.00↓22.3 years↑
"
: Double the number of +1/+1 counters on this creature."
: Double the number of +1/+1 counters on this creature."
Savageborn Hydra77%
$0.46↑#114560.3113.3 years↑
"This creature enters with X +1/+1 counters on it."
Marketback Walker77%
$0.37↑#4072↑0.21↓1.6 years↓
"This creature enters with X +1/+1 counters on it."
Junk Golem77%
$0.29↑#30022↓0.2724.9 years↑
"This creature enters with three +1/+1 counters on it."