Rambling Possum 

Creature — Possum Mount
$0.13 #20904 0.00 2.4 years
Whenever this creature attacks while saddled, it gets +1/+2 until end of turn. Then you may return any number of creatures that saddled it this turn to their owner's hand.
Saddle 1 (Tap any number of other creatures you control with total power 1 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
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Cards similar to Rambling Possum 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.
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$0.14↑#220600.14↑1.6 years
"Whenever this creature attacks while saddled, it gets +2/+2 until end of turn."
+1 more matching line
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$0.16↑#191860.17↑1.6 years
"Whenever this creature attacks while saddled, it gets +0/+3 until end of turn."
+1 more matching line
Scrappy Bruiser82%
$0.17↑#16232↑0.003.4 years
"Whenever this creature attacks, up to one target attacking creature gets +2/+0 and gains trample until end of turn. Return that creature to its owner's hand at end of combat."