Sahagin 
Creature — Merfolk Warrior
$0.15 #17590 0.30 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 and it can't be blocked this turn.
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Cards similar to Sahagin expected a card that isn't here?
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Ultros, Obnoxious Octopus91%
$0.21↑#146620.361.4 years
"Whenever you cast a noncreature spell, if at least eight mana was spent to cast it, put eight +1/+1 counters on this card."
Blazing Bomb88%
$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."
TVA Bureaucrat84%
$0.26↑#30161↓0.16↓0.3 years↓
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Elusive Spellfist84%
$0.12↓#194010.05↓11.6 years↑
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Ichor Synthesizer84%
$0.14↓#22384↓0.313.7 years↑
"Whenever you cast a noncreature spell, put an oil counter on this creature."
Razzle-Dazzler82%
$0.06↓#152100.06↓2.5 years↑
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. It can't be blocked this turn."
The Emperor of Palamecia // The Lord Master of Hell82%
$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."
Sprite Dragon80%
$0.38↑#6341↑0.06↓6.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops80%
$0.21↑#186780.00↓6.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion80%
$0.29↑#203340.18↓9.1 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler80%
$0.19↑#7553↑0.00↓2.2 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."
Lockjaw, Slobbering Teleporter80%
$0.31↑#147640.320.3 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, put a +1/+1 counter on this card. When you do, this card and up to one other target creature you control can't be blocked this turn."
Shantotto, Tactician Magician78%
$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."
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."
Machine Man, Model X-5176%
$0.23↑#25504↓0.350.3 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this card and he gains flying until end of turn."
Spellgorger Weird76%
$0.09↓#163780.06↓7.5 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Prompto Argentum76%
$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."
Sword Coast Serpent // Capsizing Wave74%
$0.24↑#6580↑0.12↓4.4 years↑
"This creature can't be blocked as long as you've cast a noncreature spell this turn."