Ultros, Obnoxious Octopus 
Legendary Creature — Octopus
$0.21 #14662 0.36 1.4 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%
$0.15↓#175900.301.4 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%
$0.20↓#19052↓0.55↑12.1 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%
$0.09↓#157010.06↓1.4 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%
$0.10↓#147200.00↓0.9 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
The Emperor of Palamecia // The Lord Master of Hell83%
$0.28↑#4334↑0.291.4 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on this card. Then if it has three or more +1/+1 counters on it, transform it."
Niblis of Frost82%
$0.37↑#8253↑0.62↑10.2 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."
Tempest Angler80%
$0.19↓#7553↑0.00↓2.2 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops80%
$0.21#18678↓0.00↓6.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion80%
$0.29↑#20334↓0.18↓9.1 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Chandra's Emberling80%
$0.17↓#25096↓0.10↓0.0 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Sprite Dragon80%
$0.38↑#6341↑0.06↓6.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Shantotto, Tactician Magician80%
$0.17↓#9806↑0.60↑1.4 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."
Wavecrash Triton80%
$0.12↓#26629↓0.13↓13.1 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%
$0.25↑#159220.412.5 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."
Quake, Agent of S.H.I.E.L.D.78%
$0.23↑#18806↓0.65↑0.3 years↓
"Whenever you cast a noncreature spell, tap target creature or land."
Prompto Argentum78%
$0.21#10184↑0.06↓1.4 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, create a Treasure token."
Spellgorger Weird76%
$0.09↓#163780.06↓7.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Liberator, Urza's Battlethopter76%
$6.42↑#1252↑0.333.9 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."
The Prima Vista76%
$0.19↓#19711↓0.00↓1.4 years
"Whenever you cast a noncreature spell, if at least four mana was spent to cast it, this card becomes an artifact creature until end of turn."
Galvanic Giant // Storm Reading76%
$0.23↑#125260.383.1 years↑
"Whenever you cast a spell with mana value 5 or greater, tap target creature an opponent controls and put a stun counter on it."