Elemental Mascot {1}{U}{R}
Creature — Elemental Bird
Flying, vigilance
Opus — 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.
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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 99%
$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."
Colorstorm Stallion 97%
$0.43#14924
"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."
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 96%
$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."
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 93%
$0.34#7255
"Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn."
Kiln Fiend 91%
$0.21#16641
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Mercurial Geists 91%
$0.04#25314
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Deluge Virtuoso 91%
$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."
Eager First-Year 89%
$0.04#27236
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Lorehold Pledgemage 89%
$0.14#27121
"Whenever you cast or copy an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Festival Crasher 89%
$0.27#19713
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Ghitu Amplifier 89%
$0.04#24902
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Storm Skreelix 89%
$0.16#17662
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."