Sahagin 
Creature — Merfolk Warrior
$0.11 #17573 0.36 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.
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Cards similar to Sahagin expected a card that isn't here?
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Ultros, Obnoxious Octopus91%
$0.20↑#146960.47↑1.2 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."
TVA Bureaucrat89%
$0.12↑#30461↓0.00↓0.2 years↓
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Elusive Spellfist89%
$0.12↑#189710.24↓11.4 years↑
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Blazing Bomb88%
$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-pine87%
$0.15↑#147510.00↓0.8 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Sprite Dragon87%
$0.36↑#6210↑0.06↓6.4 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Pyroceratops87%
$0.17↑#183220.00↓6.4 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Tempest Angler87%
$0.21↑#7286↑0.06↓2.1 years
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Deeproot Champion87%
$0.30↑#200240.25↓8.9 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Ichor Synthesizer84%
$0.13↑#22107↓0.00↓3.6 years↑
"Whenever you cast a noncreature spell, put an oil counter on this creature."
Razzle-Dazzler82%
$0.04↓#149440.56↑2.4 years↑
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. It can't be blocked this turn."
Shantotto, Tactician Magician82%
$0.17↑#9991↑0.341.2 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."
Machine Man, Model X-5180%
$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."
Lockjaw, Slobbering Teleporter80%
$0.33↑#159560.00↓0.2 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."
The Emperor of Palamecia // The Lord Master of Hell78%
$0.28↑#4552↑0.48↑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 The Emperor of Palamecia. Then if it has three or more +1/+1 counters on it, transform it."
Spellgorger Weird78%
$0.08↓#161000.19↓7.3 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this creature."
Liberator, Urza's Battlethopter76%
$6.14↑#1251↑0.343.8 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."
Levitating Statue76%
$0.12↑#176830.00↓3.8 years↑
"Whenever you cast a noncreature spell, put a +1/+1 counter on this artifact."
Sky Theater Strix76%
$0.03↓#25768↓0.00↓7.3 years↑
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn."
Cunning Breezedancer76%
$0.16↑#24667↓0.3311.4 years↑
"Whenever you cast a noncreature spell, this creature gets +2/+2 until end of turn."