A Stage 1 Pokemon Card of type Water with the title Poliwhirl and 70 HP of rarity Common evolved from Poliwag from the set Unseen Forces.  It has the attack Energy Ball with the cost Colorless, Colorless, the energy cost 2 and the damage of 30+ with the description: Does 30 damage plus 10 more damage for each Energy attached to Poliwhirl but not used to pay for this attack's Energy cost. You can't add more than 20 damage in this way. It has weakness against Lightning 2. 
Poliwhirl