I think CGC needs to (and somewhat has) begun to tighten up and PSA has begun to loosen up
During this, you do everything else play cards as resources (ink), play other cards after paying the ink cost, use their abilities, or gain victory points
Special Energies : They provide and additional effect, in addition to the energy
There was one for the Tyranids, Necrons, all the Warhammer 40k Imperium of Man factions, and all the Warhammer 40k Chaos factions, each featuring powerful and flavorful cards, which went down a treat with fans
But in recent times, its easier to fire a draft or to find a Commander pod than to play casual or competitive Standard at the LGS, and even Eternal formats like Modern or Legacy see more play due to these formats slower rate of change
Pokmon TCG cards have lots of different styles and ways to measure their worth