Furnace Spirit 

Creature — Spirit
Haste
{R}: This creature gets +1/+0 until end of 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.
Pyre Charger 100%
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"{R}: This creature gets +1/+0 until end of turn."
+1 more matching line
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"{R}: This creature gets +1/+0 until end of turn."
+1 more matching line