Zap & Lightning: Zap is best for resetting attackers and those pesky inferno towers. Avoid using these guys on offense, as they are easy to get positive elixir trades from.
Versatility is the name of the game here. Mega Minion & Minions: Two fantastic defensive cards, use MM against wizards/musketeer/exec with tower help, and minions against hog/miner/graveyard. He can also go on offense when available and can do some serious damage with a couple hits. His shield makes him spell resistant too, which makes him all the more difficult to deal with when he’s defending. If he is charged when he hits on defense, he will have more leftover health for a counterattack, so place him in the back when you can.
For 4 elixir, he will counter any squishy troops, deals easily with ebarbs/regular barbs, and does enough dps to help whittle down a tank.
Dark Prince: This guy is your other star, and is surprisingly versatile in this deck.