As a Flash enchantment that grants Hexproof, this is the perfect card to cast in response to a removal spell
and Smash fits that bill nicely, mostly because they deal damage to other cards for a relatively low cost
// Reach, trample The value of X in Summon: Titan's third chapter ability is calculated only once, as the ability resolves
However, its in Arthurs ability that he truly shines: when played, he can give a chosen character Challenger +2 and Resist +2 (that means they get +2 Strength while Challenging and a reduction of 2 damage thats being dealt to them), plus they can also challenge Ready, not Exerted, characters on the same turn too
This synergizes great with something like Teeth and Ambitions, turning that song into deal 4 damage to your opponent's characters, either all to one character or split into two 2 damage pings