Keep in mind that the opponents will always try to get rid of your creatures or at the very least, try to have more creatures than your opponent so that you can force the opponent to realize that youll be the one who is dealing more damage
Sneak Attack, a rare card from Urzas Saga , has a similar mechanic, but adding it to your deck will cost a pretty penny
The picture does not look like a 1/3 unfortunately
But there certainly look like there may be enough cards for them to be real in a way that they never were before
Sinkhole is also devastating in this position because if you skip their turn and follow up with Atlantean Fate or Smokestacks of Gnaak on the next turn, you can disrupt all of their sites
There is a fair amount of crossover here with the white-black sacrifice decks, which is helpful when building a deck because there are more black cards that work for both