case of booster boxes pokemon TCG: Chinese - Gem Vol 4 [Booster Box] Each case has an easy Pokemon: Mega Evolution Ascended Heroes

It's not exactly 'lightning from your fingers', but Brash Taunter is one of the funniest creatures in Magic, just having the little guy out can make you much harder to attack into, and before your turn if you didn't need to remove/burn something you can use mana you're holding up to pick a fight with the biggest creature on board

Look at the right edge of the artwork box

However, its most likely that it was Costas card

The ever popular Wilson, Refined Grizzly +Cultist of the Absolute one-two punch give you quite the angle on commander damage and Rancor gets your power to 7, while Scute Swarm, or Jadar, Ghoulcaller of Nephalia keep you well stocked with easy sacrifice fodder