Leader Smoker has a built-in cost-reduction effect, but the list has tons of cost-reducers like Helmeppo, Hina, and Ice Age, to help you set up your KO effects
So far, we've seen Abomasnow with Vigor Link, which makes attacks cost one less energy, Magnezone and Raichu with Resiliance Link, which means the Pokemon take 30 less damage, Crobat with Cunning Link, which allows you to deal 30 damage to the opponents active Pokemon once per turn, Rotom and Heatran with Speed Link, which removes their retreat cost, and Tyranitar and Carnevine with Power Link, which buffs the Pokemon's attacks by 30 damage
the Gaping Dragon from Dark Souls 1
The cards defined the core ability of each color, but they proved to be disparate in power
There will certainly be more leaks and rumors as we get closer to the expansion release