Manaplasm {2}{G}
Creature — Ooze
Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is that spell's mana value.
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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.
Sky Theater Strix 87%
$0.05#25287
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn."
TVA Bureaucrat 85%
$0.25#31142
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Elusive Spellfist 85%
$0.12#18514
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn."
Jeskai Devotee 84%
$0.06#22249
"Whenever you cast your second spell each turn, this creature gets +1/+1 until end of turn."
Slickshot Show-Off 82%
$6.71#9004
"Whenever you cast a noncreature spell, this creature gets +2/+0 until end of turn."
Incursion Specialist 82%
$0.15#27673
"Whenever you cast your second spell each turn, this creature gets +2/+0 until end of turn and can't be blocked this turn."
Gravelgill Duo 80%
$0.08#29346
"Whenever you cast a blue spell, this creature gets +1/+1 until end of turn."
Crackling Cyclops 80%
$0.14#14485
"Whenever you cast a noncreature spell, this creature gets +3/+0 until end of turn."
Safehold Duo 80%
$0.12#30767
"Whenever you cast a green spell, this creature gets +1/+1 until end of turn."
Cunning Breezedancer 80%
$0.15#24313
"Whenever you cast a noncreature spell, this creature gets +2/+2 until end of turn."