Giant Beaver {3}{G}
Creature — Beaver Mount
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 that do something similar expected a card that isn't here?
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Bulwark Ox 90%
$0.36#7273
"Whenever this creature attacks while saddled, put a +1/+1 counter on target creature."
+1 more matching line
District Mascot 89%
$0.35#7180
"Whenever this creature attacks while saddled, put a +1/+1 counter on it."
+1 more matching line