Manaplasm 
Creature — Ooze
$0.18 #16329 0.40 17.9 years
Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is that spell's mana value.
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Cards similar to Manaplasm expected a card that isn't here?
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Erratic Cyclops89%
$0.15↓#183470.507.9 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Jamie McCrimmon84%
$0.24↑#155770.13↓2.9 years↓
"Whenever you cast a historic spell, this card gets +X/+X until end of turn, where X is that spell's mana value."
Livaan, Cultist of Tiamat84%
$0.22↑#9264↑0.364.2 years↓
"Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value."
Endrek Sahr, Master Breeder82%
$1.69↑#3218↑0.27↓19.9 years↑
"Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value."
Skittering Cicada80%
$13.26↑#3346↑0.313.1 years↓
"Whenever you cast a colorless spell, until end of turn, this creature gains trample and gets +X/+X, where X is that spell's mana value."
Dancing from Dark to Dawn80%
$11.42↑#9684↑0.00↓0.1 years↓
"Whenever you cast a creature spell, put X +1/+1 counters on target creature you control, where X is that spell's mana value."
Emissary Escort79%
$0.19↑#9117↑0.23↓1.1 years↓
"This creature gets +X/+0, where X is the greatest mana value among other artifacts you control."
Leering Emblem77%
$2.92↑#178590.20↓18.1 years
"Whenever you cast a spell, equipped creature gets +2/+2 until end of turn."
Kulrath Mystic75%
$0.07↓#25235↓0.00↓0.6 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature gets +2/+0 and gains vigilance until end of turn."
Renegade Bull75%
$0.19↑#143560.00↓0.4 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Runadi, Behemoth Caller74%
$16.16↑#7684↑0.19↓3.8 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."
Stormkeld Prowler74%
$0.13↓#25733↓0.353.0 years↓
"Whenever you cast a spell with mana value 5 or greater, put two +1/+1 counters on this creature."
Ascendant Packleader74%
$0.38↑#8310↑0.504.8 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Lurking Lizards74%
$0.11↓#188480.26↓1.0 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Keeper of Secrets74%
$10.72↑#3243↑0.503.9 years↓
"Whenever you cast a spell from anywhere other than your hand, this creature deals damage equal to that spell's mana value to target opponent."
Crackling Cyclops74%
$0.11↓#146580.14↓1.8 years↓
"Whenever you cast a noncreature spell, this creature gets +3/+0 until end of turn."
Frenzied Devils74%
$0.05↓#25502↓0.00↓4.8 years↓
"Whenever you cast a noncreature spell, this creature gets +2/+2 until end of turn."
Sunbird's Invocation74%
$0.25↑#1885↑0.328.9 years↓
"Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order."
Kurgadon73%
$0.19↑#28580↓0.06↓23.3 years↑
"Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on this creature."
Tanufel Rimespeaker73%
$0.24↑#11913↑0.00↓0.6 years↓
"Whenever you cast a spell with mana value 4 or greater, draw a card."