Mercurial Geists 
Creature — Spirit
$0.03 #26102 0.06 10.2 years
Flying
Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn.
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Wee Dragonauts100%
$0.06↑#18706↑0.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Aven Wind Mage100%
$0.11↑#233410.33↑8.3 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Kiln Fiend100%
$0.11↑#17248↑0.0616.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Festival Crasher100%
$0.18↑#20255↑0.005.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Fire Urchin100%
$0.05↑#257480.008.0 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Ghitu Amplifier95%
$0.12↑#258140.004.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Erratic Cyclops95%
$0.15↑#18693↑0.19↑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."
Charmbreaker Devils94%
$0.17↑#7555↑0.1115.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Blistercoil Weird94%
$0.25↑#229410.0714.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Storm Skreelix94%
$0.20↑#18537↑0.075.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
+1 more matching line
Aberrant Manawurm94%
$0.16↑#231710.050.5 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."
Pyre Hound92%
$0.07↑#19339↑0.19↑10.5 years
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Electrostatic Infantry92%
$0.34↑#6533↑0.074.1 years↓
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Spellrune Painter // Spellrune Howler92%
$0.14↑#209150.005.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +2/+2 until end of turn."
Frolicking Familiar // Blow Off Steam92%
$0.31↑#8567↑0.113.1 years↓
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
+1 more matching line
Nivix Cyclops92%
$0.11↑#225810.0613.5 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."
Clever Lumimancer90%
$0.18↑#19689↑0.21↑5.5 years↓
"Whenever you cast or copy an instant or sorcery spell, this creature gets +2/+2 until end of turn."
Lorehold Pledgemage90%
$0.17↑#279550.005.5 years↓
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Fluxcharger90%
$0.15↑#284280.0013.5 years↑
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."
Umara Mystic90%
$0.17↑#20771↑0.006.1 years↓
"Whenever you cast an instant, sorcery, or Wizard spell, this creature gets +2/+0 until end of turn."