Molten-Core Maestro 
Creature — Goblin Bard
$0.40 #7642 0.28 0.5 years
Menace
Opus — Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, add an amount of equal to this creature's power.
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Tackle Artist90%
$0.18↓#18749↓0.06↓0.5 years
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, put two +1/+1 counters on this creature instead."
Aberrant Manawurm88%
$0.16↓#23171↓0.05↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell."
Spectacular Skywhale85%
$0.16↓#19016↓0.04↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn. If five or more mana was spent to cast that spell, put three +1/+1 counters on this creature instead."
Caldera Pyremaw84%
$0.68↑#4377↑0.56↑1.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent."
Pyre Hound84%
$0.07↓#19339↓0.1910.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Electrostatic Infantry84%
$0.34↓#65330.07↓4.1 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Expressive Firedancer82%
$0.06↓#22223↓0.08↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, this creature also gains double strike until end of turn."
Feral Ghoul82%
$1.77↑#4218↑0.322.6 years↑
"Menace"
Deluge Virtuoso80%
$0.09↓#21012↓0.14↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, this creature gets +2/+2 until end of turn instead."
Stalactite Stalker80%
$0.24↓#12670↓0.06↓2.9 years↑
"Menace"
Flaming Tyrannosaurus80%
$8.43↑#3179↑0.363.0 years↑
"Menace"
Rust Harvester79%
$0.24↓#15416↓0.00↓1.2 years
"Menace"
Teapot Slinger79%
$0.26↓#90190.06↓2.2 years↑
"Menace"
Aven Wind Mage78%
$0.11↓#23341↓0.338.3 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Wee Dragonauts78%
$0.06↓#18706↓0.2820.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Deep Goblin Skulltaker78%
$0.15↓#19093↓0.00↓2.9 years↑
"Menace"
Fire Urchin78%
$0.05↓#25748↓0.00↓8.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Festival Crasher78%
$0.18↓#20255↓0.00↓5.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists78%
$0.03↓#26102↓0.06↓10.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Kiln Fiend77%
$0.11↓#17248↓0.06↓16.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."