If money isn't a problem, though, you can go ahead and buy the Kanto promos (or any of the other Series 1 cards) at TCGPlayer
In MTG terms, this ability translates to: If it hits you, you die. Of course, thats held back by a mana value of 7 and having an attack trigger, nothing a few Sneak Attack effects and a haste enabler or two cant solve
We generally want to suspend all our cards and have a couple of synergies to help get them down quicker
That makes it significantly better than it looks, since there'll never be a situation where you're forced to sacrifice it against your will
KEEP IN MIND this locks you into dark heroes for the rest of the turn, so make sure you already have all the non-dark monsters on the field you want first (Wonder Driver, Absolute Zero, Sunrise, etc.)
I was all set to pay the ward cost, but now I have to choose