Speaking of energy, its Max Mindstorm inflicts 60 damage for every energy card attached to any of the opponent's Pokmon
Jace, the Mind Sculptor Widely regarded as one of the best planeswalkers, Jace offers flexibility and power
They returned with more frequency, and finally just became an evergreen mechanic starting with Zendikar Rising
Usually, this would be used in a landfall deck to get more land drop triggers, or as a deck thinner to remove a couple of basic lands that you would otherwise draw
Flapple is the most obvious about it, but even Hydrapple seems to have the original apple stuck into its main head's horn showing how much it has grown
But the flexibility to counter and bounce and still draw a card is so key in a multiplayer game