Notably it's non-legendary card, not non-legendary creature card, and while you're typically going to grab a creature, there are plenty of scenarios where you might want another card in your graveyard, for example, Past in Flames FromTheShire: Getting another copy of an Entomb effect is great, even if it is only for nonlegendaries
In Mega Dream ex and Ascended Heroes, this design makes a big comeback, with M Gardevoir ex and M Lucario ex leading the charge
First, for these cards that have been cheating on mana value, the mana cost in the top right is the mana value
I would agree with @quuador, and others on their assessment, but it is tough to truly be sure without the card in hand
In fact, I've seen a few matches end quickly because one player found a powerful Pokemon and proceeded to wipe out their opponent before they could build up enough Energy to respond