Erratic Cyclops 
Creature — Cyclops Shaman
$0.15 #18693 0.19 8.0 years
Trample
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.
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Aven Wind Mage95%
$0.11↓#23341↓0.33↑8.3 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Fire Urchin95%
$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."
+1 more matching line
Wee Dragonauts95%
$0.06↓#187060.2820.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Festival Crasher95%
$0.18↑#202550.00↓5.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists95%
$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 Fiend95%
$0.11↓#172480.06↓16.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Renegade Bull91%
$0.19↑#13875↑0.08↓0.5 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."
+1 more matching line
Aberrant Manawurm91%
$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."
+1 more matching line
Blistercoil Weird90%
$0.25↑#22941↓0.07↓14.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Pyre Hound90%
$0.07↓#193390.1910.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
+1 more matching line
Electrostatic Infantry90%
$0.34↑#6533↑0.07↓4.1 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Ghitu Amplifier89%
$0.12↓#25814↓0.00↓4.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Charmbreaker Devils88%
$0.17↑#7555↑0.1115.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Nivix Cyclops88%
$0.11↓#22581↓0.06↓13.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn and can attack this turn as though it didn't have defender."
Pyroceratops88%
$0.21↑#186780.00↓6.5 years↓
"Trample"
Spellrune Painter // Spellrune Howler86%
$0.14↓#209150.00↓5.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Storm Skreelix86%
$0.20↑#185370.07↓5.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Frolicking Familiar // Blow Off Steam85%
$0.31↑#8567↑0.113.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Manaplasm85%
$0.20↑#164630.00↓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."
Fluxcharger85%
$0.15#28428↓0.00↓13.5 years↑
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."