Being able to take out the smaller things and keep the bigger stuff about makes mass removal feel very one sided against the decks you have it in against
Double-activation is almost certainly an immediate victory
10 Kaito, Bane Of Nightmares Showcase & Texture Foil - $73.16 Bringing back an older mechanic, this version of Kaito has a fascinating use of the ninjutsu mechanic, letting you play him for one mana cheaper and in place of your current attacking creature so long as you had a creature be unblocked by your opponent
At the very least, you will end up playing copies of the other removal spell on your sideboard
Moreover, since Shining Shoal redirects the damage from a source of your choice would deal to you and/or creatures you control, as Shoals effect is applied you can choose how much damage from each recipient will be redirected
This is one of the scariest threats in the set, and it feels very close to a rare in Limited