Giant Beaver 

Creature — Beaver Mount
$0.14 #18750 0.00 2.4 years
Vigilance
Whenever this creature attacks while saddled, put a +1/+1 counter on target creature that saddled it this turn.
Saddle 3 (Tap any number of other creatures you control with total power 3 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
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Cards similar to Giant Beaver 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.
Ornery Tumblewagg90%
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"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
+1 more matching line
Bulwark Ox90%
$0.30↑#7021↑0.18↑1.6 years
"Whenever this creature attacks while saddled, put a +1/+1 counter on target creature."
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District Mascot87%
$0.35↑#6954↑0.14↑1.6 years
"Whenever this creature attacks while saddled, put a +1/+1 counter on it."
+1 more matching line