This damage rate is pretty terrible for any Pokmon, let alone an ex , but its secondary effect allows you to attach 2 Metal Energy to any of your Benched Pokmon, making "Dialga ex" a strong support option for Metal and/or Colorless Pokmon
Think of the ichor frames from Phyrexia: All Will Be One , the Ring frame and scene cards from Tales of Middle-earth , or the wanted posters from Outlaws of Thunder Junction
It can even do some work later in the game if you need to dig through your deck for something specific
Lets take a look at what keeps people interested after all these years and why, despite loving the game, I wouldnt recommend it to you
Disable your opponents Bloom Tender, Mother of Runes or Viscera Seer, and give yourself that effect instead
How To Use Threshold In general, threshold isnt one of Magics strongest mechanics, with most of the benefits you get from having a large graveyard being fairly minor