Much like how Mega Pokmon bring an edge of extreme power to the game, M Pokmon EX cards bring intense raw strength, abilities, and effects into the TCG
Snorlax EX can stall in the Active Spot whilst maintaining good health, Giratina EX can farm Energy, and Lunala EX (once in play with Cosmog + Rare Candy) transfers all Energy to Snorlax EX
However, not having to see your opponents favorite monster crawling back is benefit enough
If heads, a chocolate bar appears and restores your HP
The Wise Mothman would have you believe that there are benefits to accruing rad counters, and you do get to fill your graveyard somewhat quickly
I usually see this card in decks built around Tergrid, God of Fright because of how effective it is at removing resources from opponents and potentially stealing them with her ability