Abolish 


Instant
You may discard a Plains card rather than pay this spell's mana cost.
Destroy target artifact or enchantment.
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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.
Kyren Legate 84%
$0.30#27488
"If an opponent controls a Plains and you control a Mountain, you may cast this spell without paying its mana cost."
Massacre 84%
$1.86#11190
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."
Oath of Nissa 82%
$0.50#7671
"You may spend mana as though it were mana of any color to cast planeswalker spells."
Sivvi's Ruse 81%
$0.19#26312
"If an opponent controls a Mountain and you control a Plains, you may cast this spell without paying its mana cost."
Cho-Arrim Legate 80%
$0.22#27844
"If an opponent controls a Swamp and you control a Plains, you may cast this spell without paying its mana cost."