Bitterthorn, Nissa's Animus 
Legendary Artifact — Equipment
$5.84 #1995 0.24 3.4 years
Living weapon (When this Equipment enters, create a 0/0 black Phyrexian Germ creature token, then attach this to it.)
Equipped creature gets +1/+1.
Whenever equipped creature attacks, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Equip 
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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.
Sword of the Animist97%
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"Whenever equipped creature attacks, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle."
+2 more matching lines
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"Equipped creature gets +1/+0."
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"Equipped creature gets +0/+1."
+1 more matching line
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"Equipped creature gets +1/+2."
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Ancestral Blade88%
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"Equipped creature gets +1/+1."
+1 more matching line
Valkyrie's Sword87%
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"Equipped creature gets +2/+1."
+1 more matching line
Conductive Machete85%
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"Equipped creature gets +2/+1."
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One with Nature84%
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"Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle."