Oliphaunt 

Creature — Elephant
Trample
Whenever this creature attacks, another target creature you control gets +2/+0 and gains trample until end of turn.
Mountaincycling {1} ({1}, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)
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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.
Eel-Hounds 99%
$0.13#21042
"Whenever this creature attacks, another target creature you control gets +2/+2 and gains trample until end of turn."
+1 more matching line
Ashroot Animist 92%
$0.19#9382
"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
Gruul Beastmaster 86%
$0.17#24168
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Yotian Frontliner 86%
$0.22#20990
"Whenever this creature attacks, another target creature you control gets +1/+1 until end of turn."
Foot Elite 85%
$0.15#18022
"Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn."
Hardened Escort 85%
$0.12#15219
"Whenever this creature attacks, another target creature you control gets +1/+0 and gains indestructible until end of turn."