Riparian Tiger 


Creature — Cat
Trample
When this creature enters, you get {E}{E} (two energy counters).
Whenever this creature attacks, you may pay {E}{E}. If you do, it gets +2/+2 until end of turn.
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Cards that do something similar expected a card that isn't here?
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Aetherstream Leopard 97%
$0.06#26546
"Whenever this creature attacks, you may pay {E}. If you do, it gets +2/+0 until end of turn."
+2 more matching lines
Voltaic Brawler 81%
$0.16#27470
"Whenever this creature attacks, you may pay {E}. If you do, it gets +1/+1 and gains trample until end of turn."
+1 more matching line
Thriving Turtle 81%
$0.10#19903
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Thriving Rhino 81%
$0.10#26093
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Scrapper Champion 81%
$0.23#22880
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Thriving Ibex 81%
$0.04#26999
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Thriving Grubs 81%
$0.04#25555
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Thriving Rats 81%
$0.08#23757
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Thriving Skyclaw 80%
$0.16#20424
"Whenever this creature attacks, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on it."
+1 more matching line
Territorial Aetherkite 96%
$0.19#11477
"When this creature enters, you get {E}{E} . Then you may pay one or more {E}. When you do, this creature deals that much damage to each other creature."
Amped Raptor 93%
$0.18#7368
"When this creature enters, you get {E}{E} . Then if you cast it from your hand, exile cards from the top of your library until you exile a nonland card. You may cast that card by paying an amount of {E} equal to its mana value rather than paying its mana cost."