Oliphaunt 

Creature — Elephant
$0.24 #4143 0.23 3.2 years
Trample
Whenever this creature attacks, another target creature you control gets +2/+0 and gains trample until end of turn.
Mountaincycling
(
, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)
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Cards similar to Oliphaunt 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.
Eel-Hounds88%
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"Whenever this creature attacks, another target creature you control gets +2/+2 and gains trample until end of turn."
+1 more matching line
Malamet Brawler82%
$0.22↓#16106↓0.00↓2.8 years
"Whenever this creature attacks, target attacking creature gains trample until end of turn."
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"Whenever this creature attacks, attacking creatures gain trample until end of turn."
Ashroot Animist78%
$0.26↑#9286↓0.161.8 years↓
"Whenever this creature attacks, another target creature you control gains trample and gets +X/+X until end of turn, where X is this creature's power."
+1 more matching line