Stormkeld Prowler 
Creature — Human Rogue
$0.10 #26218 0.05 3.1 years
Whenever you cast a spell with mana value 5 or greater, put two +1/+1 counters on this creature.
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Ascendant Packleader100%
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"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
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"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
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"Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on this creature."
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$0.23↑#12381↑0.003.1 years
"Whenever you cast a spell with mana value 5 or greater, put a +1/+1 counter on this creature."
Kalemne, Disciple of Iroas92%
$12.79↑#8486↑0.0710.9 years↑
"Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter."
Herald of Ilharg90%
$3.26↑#11696↑0.35↑2.7 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 Wakanda90%
$0.20↑#16991↑0.16↑0.3 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%
$0.06↓#252510.010.7 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%
$0.20↑#11936↑0.137.0 years↑
"Whenever you cast a spell with mana value 5 or greater, draw a card."
Tanufel Rimespeaker86%
$0.22↑#11623↑0.050.7 years↓
"Whenever you cast a spell with mana value 4 or greater, draw a card."
T'Challa, the Black Panther86%
$0.42↑#15104↑0.37↑0.3 years↓
"Whenever you cast an artifact spell with mana value 4 or greater, put two +1/+1 counters on this card."
Runadi, Behemoth Caller86%
$14.85↑#7825↑0.50↑3.9 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%
$0.11↑#229960.073.1 years
"Whenever you cast a spell with mana value 5 or greater, create a Food token."
Up the Beanstalk84%
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"When this enchantment enters and whenever you cast a spell with mana value 5 or greater, draw a card."
Angry Rabble83%
$0.11↑#18536↑0.141.1 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature deals 1 damage to each opponent."
Enraged Flamecaster82%
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"Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent."
Etherium Spinner82%
$0.25↑#14197↑0.21↑5.3 years↑
"Whenever you cast a spell with mana value 4 or greater, create a 1/1 colorless Thopter artifact creature token with flying."
Spider Manifestation80%
$0.27↑#3800↑0.21↑1.1 years↓
"Whenever you cast a spell with mana value 4 or greater, untap this creature."
Boar-q-pine80%
$0.10#14720↑0.000.9 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Setessan Oathsworn79%
$0.16↑#238890.1112.7 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."