Manaplasm 
Creature — Ooze
$0.20 #16463 0.00 18.0 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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Erratic Cyclops85%
$0.15↓#186930.19↑8.0 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%
$0.22↑#159250.39↑3.0 years↓
"Whenever you cast a historic spell, this card gets +X/+X until end of turn, where X is that spell's mana value."
Endrek Sahr, Master Breeder82%
$1.60↑#3210↑0.16↑20.0 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%
$12.25↑#3303↑0.40↑3.2 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%
$5.83↑#6377↑0.46↑0.2 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."
Livaan, Cultist of Tiamat80%
$0.18↓#9377↑0.004.4 years↓
"Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value."
Emissary Escort79%
$0.19↓#9002↑0.001.2 years↓
"This creature gets +X/+0, where X is the greatest mana value among other artifacts you control."
Leering Emblem76%
$3.11↑#183080.12↑18.2 years
"Whenever you cast a spell, equipped creature gets +2/+2 until end of turn."
Kulrath Mystic76%
$0.06↓#25251↓0.010.7 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↓#138750.080.5 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%
$14.85↑#7825↑0.50↑3.9 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%
$0.10↓#26218↓0.053.1 years↓
"Whenever you cast a spell with mana value 5 or greater, put two +1/+1 counters on this creature."
Lurking Lizards74%
$0.13↓#187970.001.1 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Ascendant Packleader74%
$0.32↑#8160↑0.15↑4.9 years↓
"Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature."
Keeper of Secrets74%
$7.59↑#3300↑0.36↑4.0 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."
Sunbird's Invocation74%
$0.23↑#1941↑0.43↑9.1 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%
$0.18↓#28969↓0.31↑23.4 years↑
"Whenever you cast a creature spell with mana value 6 or greater, put three +1/+1 counters on this creature."
Chrome Host Seedshark72%
$0.22↑#3532↑0.16↑3.5 years↓
"Whenever you cast a noncreature spell, incubate X, where X is that spell's mana value."
Bounteous Kirin72%
$0.39↑#19757↓0.0521.4 years↑
"Whenever you cast a Spirit or Arcane spell, you may gain life equal to that spell's mana value."
Gloryscale Viashino71%
$0.15↓#24799↓0.0717.5 years
"Whenever you cast a multicolored spell, this creature gets +3/+3 until end of turn."