Ultros, Obnoxious Octopus 
Legendary Creature — Octopus
$0.20 #14696 0.47 1.2 years
Whenever you cast a noncreature spell, if at least four mana was spent to cast it, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Whenever you cast a noncreature spell, if at least eight mana was spent to cast it, put eight +1/+1 counters on Ultros.
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Sahagin91%
$0.11↓#175730.36↓1.2 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on this creature and it can't be blocked this turn."
Quiet Contemplation91%
$0.21↑#18701↓0.88↑11.9 years↑
"Whenever you cast a noncreature spell, you may pay . If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
Blazing Bomb89%
$0.16↓#156730.23↓1.2 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on this creature."
Boar-q-pine86%
$0.15↓#147510.00↓0.8 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops86%
$0.17↓#18322↓0.00↓6.4 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler86%
$0.21↑#7286↑0.06↓2.1 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion86%
$0.30↑#20024↓0.25↓8.9 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Sprite Dragon86%
$0.36↑#6210↑0.06↓6.4 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Shantotto, Tactician Magician84%
$0.17↓#9991↑0.34↓1.2 years
"Whenever you cast a noncreature spell, this card gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell. If X is 4 or more, draw a card."
Niblis of Frost82%
$0.37↑#8073↑0.25↓10.1 years↑
"Whenever you cast an instant or sorcery spell, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
The Emperor of Palamecia // The Lord Master of Hell80%
$0.28↑#4552↑0.481.2 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on The Emperor of Palamecia. Then if it has three or more +1/+1 counters on it, transform it."
Wavecrash Triton80%
$0.13↓#26426↓0.18↓12.9 years↑
"Whenever you cast a spell that targets this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Shackle Slinger80%
$0.23↑#157010.00↓2.4 years↑
"Whenever you cast your second spell each turn, choose target creature an opponent controls. If it's tapped, put a stun counter on it. Otherwise, tap it."
Spellgorger Weird79%
$0.08↓#161000.19↓7.3 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deluge Virtuoso79%
$0.10↓#21548↓0.00↓0.4 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
+1 more matching line
Quake, Agent of S.H.I.E.L.D.78%
$0.17↓#19668↓0.00↓0.2 years↓
"Whenever you cast a noncreature spell, tap target creature or land."
Machine Man, Model X-5178%
$0.24↑#26153↓0.00↓0.2 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this card and he gains flying until end of turn."
Prompto Argentum78%
$0.15↓#10322↑0.24↓1.2 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, create a Treasure token."
Levitating Statue77%
$0.12↓#17683↓0.00↓3.8 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this artifact."
Liberator, Urza's Battlethopter77%
$6.14↑#1251↑0.34↓3.8 years↑
"Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than this card's power, put a +1/+1 counter on this card."