Foraging Wickermaw 
Artifact Creature — Scarecrow
When this creature enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{1}: Add one mana of any color. This creature becomes that color until end of turn. Activate only once each 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.
Barrels of Blasting Jelly 99%
$0.20#11560
"{1}: Add one mana of any color. Activate only once each turn."