Alacrian Jaguar 

Creature — Cat Mount
Vigilance
Whenever this creature attacks while saddled, it gets +2/+2 until end of turn.
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 that do something similar expected a card that isn't here?
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Venomsac Lagac 92%
$0.13#19031
"Whenever this creature attacks while saddled, it gets +0/+3 until end of turn."
+1 more matching line
Lurking Nightstalker 87%
$0.25#31306
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Borderland Marauder 87%
$0.07#22582
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Ornery Dilophosaur 84%
$0.18#17929
"Whenever this creature attacks, if you control a creature with power 4 or greater, this creature gets +2/+2 until end of turn."
Septic Rats 82%
$0.39#10538
"Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn."
The Long Reach of Night // Animus of Night's Reach 82%
$0.22#11099
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of creature cards in defending player's graveyard."