Giant Beaver 

Creature — Beaver Mount
$0.13 #19237 0.25 2.5 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?
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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 Ox89%
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"Whenever this creature attacks while saddled, put a +1/+1 counter on it."
+1 more matching line