Free counterspells are always nice enough, and although sacrificing a non-token creature is certainly a cost, its not insurmountable in the right deck
In combination with our cheap cards generating a pile of Prowess triggers, especially if one of those cards is Titans Strength, the deck has a combo element that can win games from very far behind or close out games very quickly when ahead
Although most black decks are looking to wipe the board rather than hold it at bay, this is still somewhat unique in the color, although I bet it would see play in Zur the Enchanter on occasion if it cost three
What if the mutated creature had an ability that also existed as a keyword counter
People can be heard shouting over one another, one in particular shouting for people to get in line
That makes sense as not only is Zacian V likely the best card of the whole set, but people just seem to enjoy Sword-themed things more than Shields ( Pokmon Sword for the Nintendo Switch has sold many more copies than its Shield counterpart)