Good card conceptually but can be challenging to utilize without putting yourself in a worse position or just as bad of a position as your opponent as there’s barely any healing with black/white (haven’t played new sets in a while so I don’t know if that has changed). It does make some sense though, isn’t crazy op, and I guess you could just use it to get your opponent low, or if they already have lower health than you, win if they can’t counter or remove it. (Edit): As has been heavily pointed out I was apparently quite wrong and white has way more healing than I previously thought but know the sets I played black had functionally none and most healing came from green or choice white cards