The card has the effect of attaching an Energy from the discard pile to one of your Benched Pokmon, which is considered "weak" in the format (almost similar to Beda, the only difference being that it attaches from the hand and not from the discard), since we have better cards for power up like Roy and Melony, considering the power factor of the discard and having additional effects
Several cards have the chance to be swapped out for a different card, and you wont know which one youre going to get until you review your deck
It's even more helpful if more than one opponent has a ramping strategy
Thraximundar also doesn't have to buff itself, as you can use sacrifice cards like Covetous Elegy or Cruel Edict
Graveyard Overdrive sparked some amount of joy when I saw the lhurgoyf package, so this one wins the fun category, though Im pretty unenthused by everything thats not the lhurgoyf stuff
It doesn't matter how many creatures you attacked a player with, only that you attacked a player with at least one creature