Stormkeld Prowler 
Creature — Human Rogue
$0.13 #25733 0.35 3.0 years
Whenever you cast a spell with mana value 5 or greater, put two +1/+1 counters on this creature.
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Lurking Lizards100%
$0.11↓#18848↑0.261.0 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Ascendant Packleader100%
$0.38↑#8310↑0.50↑4.8 years↑
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Kurgadon99%
$0.19↑#285800.06↓23.3 years↑
"Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on this creature."
Tempest Hart // Scan the Clouds96%
$0.19↑#12004↑0.00↓3.0 years
"Whenever you cast a spell with mana value 5 or greater, put a +1/+1 counter on this creature."
Kalemne, Disciple of Iroas92%
$14.57↑#8437↑0.00↓10.8 years↑
"Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter."
Herald of Ilharg90%
$3.66↑#11555↑0.24↓2.5 years
"Whenever you cast a creature spell, put two +1/+1 counters on this creature. If that spell has mana value 5 or greater, this creature deals damage equal to the number of counters on it to each opponent."
Zuri, Warrior of Wakanda88%
$0.23↑#17897↑0.00↓0.2 years↓
"Whenever you cast an artifact spell with mana value 4 or greater, put a +1/+1 counter on each creature you control."
Kulrath Mystic88%
$0.07↓#252350.00↓0.6 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature gets +2/+0 and gains vigilance until end of turn."
Thunderous Snapper86%
$0.19↑#11603↑0.24↓6.9 years↑
"Whenever you cast a spell with mana value 5 or greater, draw a card."
T'Challa, the Black Panther86%
$0.46↑#16005↑0.00↓0.2 years↓
"Whenever you cast an artifact spell with mana value 4 or greater, put two +1/+1 counters on this card."
Runadi, Behemoth Caller86%
$16.16↑#7684↑0.19↓3.8 years
"Whenever you cast a creature spell with mana value 5 or greater, that creature enters with X additional +1/+1 counters on it, where X is its mana value minus 4."
Skybeast Tracker84%
$0.13#224620.293.0 years
"Whenever you cast a spell with mana value 5 or greater, create a Food token."
Up the Beanstalk84%
$2.68↑#1106↑0.58↑3.0 years
"When this enchantment enters and whenever you cast a spell with mana value 5 or greater, draw a card."
Angry Rabble83%
$0.12↓#18535↑0.251.0 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature deals 1 damage to each opponent."
Enraged Flamecaster82%
$0.16↑#14671↑0.00↓0.6 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent."
Etherium Spinner82%
$0.21↑#14066↑0.255.2 years↑
"Whenever you cast a spell with mana value 4 or greater, create a 1/1 colorless Thopter artifact creature token with flying."
Boar-q-pine80%
$0.15↑#14751↑0.00↓0.8 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops80%
$0.17↑#18322↑0.00↓6.4 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler80%
$0.21↑#7286↑0.06↓2.1 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion80%
$0.30↑#20024↑0.258.9 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."