"Elemental HERO Wildheart" + "Elemental HERO Bladedge"Must be Fusion Summoned and cannot be Special Summoned by other ways. This card can attack every monster your opponent controls (one attack on each monster per Battle Phase).
The attack is not the problem. The problem is that fusions waste too much resource to summon. Mask Hero is only -1 and you can use it to dodge removal whereas stuff like this and Plasma Vice make you go -2 and if you opponent kills it you pretty much lose the game