Colorstorm Stallion {1}{U}{R}
Creature — Elemental Horse
Ward {1}, haste
Opus — 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, create a token that's a copy of this creature.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Expressive Firedancer 98%
$0.08#22911
"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."
Elemental Mascot 97%
$0.10#21024
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn. If five or more mana was spent to cast that spell, exile the top card of your library. You may play that card until the end of your next turn."
Frolicking Familiar // Blow Off Steam 96%
$0.24#7735
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Aven Wind Mage 96%
$0.16#22687
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Spellrune Painter // Spellrune Howler 96%
$0.17#20131
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Fire Urchin 96%
$0.08#24988
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Aberrant Manawurm 95%
$0.09#24017
"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."
Eager First-Year 94%
$0.04#27236
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Lorehold Pledgemage 94%
$0.14#27121
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Renegade Bull 94%
$0.23#15025
"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."
Erratic Cyclops 94%
$0.20#17911
"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 Devils 92%
$0.34#7255
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Kiln Fiend 90%
$0.21#16641
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Mercurial Geists 90%
$0.04#25314
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Deluge Virtuoso 90%
$0.15#22270
"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."
Aquatic Alchemist // Bubble Up 89%
$0.20#14399
"Whenever you cast your first instant or sorcery spell each turn, this creature gets +2/+0 until end of turn."
Clever Lumimancer 89%
$0.28#19144
"Whenever you cast or copy an instant or sorcery spell, this creature gets +2/+2 until end of turn."
Festival Crasher 88%
$0.27#19713
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Ghitu Amplifier 88%
$0.04#24902
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."