Entropic Battlecruiser must be stationed before its effect is online, and Cool but Rude requires leveling up, but these are some of the stronger payoffs for repeated discards
Bane can also be used as a pseudo Birthing Pod, because youll sacrifice a 2/2 and maybe put a good creature like Karmic Guide on the battlefield for free (or draw a card)
If they run a 2-2 Garchomp, thisll actually hurt them more than it will help them because then theyll end up with basic-less Garchomp Xs and they cant just Aarons both of them out of the discard pile
This Rare Rainbow card is numbered 188/185 in the set
Amphed Raptor is another notable card, which allows for the exchange of energy counters for a method of drawing without spending mana cost
Another popular version of a Pikachu ex deck list thats floating around the community right now features Magnemite and Magnetonspecifically, the Surging Sparks Magneton with the Overvolt Discharge ability