You can pop cards on your side of the field and use his effect to replace your own bad cards this way
Blast of Genius: There are a lot of good things you can do for six mana, and when you draw and discard and already have six mana in play, youre generally not interested in discarding the most expensive spell you have
Gengar & Mimikyu GX #53 from Sun and Moon set Team Up
This is however a highly memory intensive process, and will bloat your file
inflict damage to your opponent equal to the ATK of that target, and if you do, return that target to the field
Late last week, one of the only "Pikachu Illustrator" cards in existence from the early days of one of the best card games sold for $1,406,250 at Heritage Auctions (as spotted by our friends at Dexerto)