If you aren't familiar with Magic (which is entirely reasonable given that we cover multiple card games on the site and there will be readers that don't particular about some of the games we cover), then the big deal with this card is the fact for 10 years, the ability simply couldn't be utilized under any circumstance at all
Anyway, Gene tends to use Pokemon with high HP while he attaches Energy cards to Diglett and Geodude on the Bench
Thief of Sanity Thief of Sanity is a card I see a lot of people taking in Cube Drafts of either Arena or MTGO, but Id say its power level really is diminished depending on how the cube is structured and what the meta looks like
Look for the Warhammer 40,000 Commander decks at your local game store, online through Amazon, and everywhere else you buy your Magic: The Gathering products
For me, the tipping point is in the card type creatures are just much better than sorceries, adding the utility of attacking and blocking, paying sacrifice and convoke costs and everything else you need a body for in Magic