I mean, Black Hole cards in RnR 1 can only inflict damage less than 500
While the Black Hole card in that Wave Master video can inflict 500 damage
It looks like Black Hole cards in RnR 2 is way very powerful
There is a card like it. It's called Darknesshole (DrknesHole). It kills a boss if it is beneath 500hp, and all viruses in a battle that are below 250hp. I'm not sure if this card is limited to Fire Leo version though.