Ornery Tumblewagg 
Creature — Brushwagg Mount
$0.36 #5181 0.22 2.5 years
At the beginning of combat on your turn, put a +1/+1 counter on target creature.
Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature.
Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
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Giant Beaver90%
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"Whenever this creature attacks while saddled, put a +1/+1 counter on target creature that saddled it this turn."
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Sazh Katzroy86%
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Bridled Bighorn86%
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"Saddle 2"
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Kalonian Hydra86%
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"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
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Fractal Harness86%
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"Whenever equipped creature attacks, double the number of +1/+1 counters on it."
Big Mother Mouser86%
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"Whenever this creature attacks, double the number of +1/+1 counters on it."
Ascendant Acolyte86%
$0.32↓#11286↓0.294.7 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
Primordial Hydra84%
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"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
Bounding Felidar84%
$0.21↓#11291↓0.11↓2.5 years
"Saddle 2"
+1 more matching line
Quilled Charger84%
$0.04↓#26194↓0.07↓2.5 years
"Saddle 2"
Brightfield Mustang84%
$0.19↓#15821↓0.00↓1.7 years
"Saddle 1"
+1 more matching line
Brightfield Glider84%
$0.11↓#20077↓0.00↓1.7 years
"Saddle 3"
+1 more matching line
Seismic Tutelage84%
$0.90↑#11095↓0.310.9 years↓
"Whenever enchanted creature attacks, double the number of +1/+1 counters on it."
Byrke, Long Ear of the Law82%
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"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
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Casey Jones, Back Alley Brute82%
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"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
+1 more matching line
Sage of the Fang82%
$0.19↓#14607↓0.07↓1.5 years
"When this creature enters, put a +1/+1 counter on target creature."
Lagorin, Soul of Alacria82%
$0.22↓#14272↓0.00↓1.7 years
"Saddle 1"
+1 more matching line