It has the howling rampage attack: for 2 energy (WC), it does 20 for each prize each player has taken. Early game, this is useless since no prizes have been taken, but late game, it can do up to 200 damage for just 2 energy. An idea I've been toying with uses Cofagrigus (PF) to knock it's self out, giving an opponent a prize, but increasing Gyarados's attack and putting damage on the board. We've seen similar combos using Shaymin EX and the Team Plasma Flareon. Gyarados doesn't do as much initial damage, but benefits from either player taking prizes. It needs another attacker (I'm thinking either Kyurem PF or Empoleon), but since stage 1 and 2 decks don't completely suck now, maybe something like this could stand a chance.
Only downside is 30HP magicarp. That would be painful to start with.
Only downside is 30HP magicarp. That would be painful to start with.